diff --git a/composer.json b/composer.json
index 9ed9017d8..83b51a174 100644
--- a/composer.json
+++ b/composer.json
@@ -83,7 +83,6 @@
 			"include/dba.php",
 			"include/enotify.php",
 			"include/items.php",
-			"include/text.php",
 			"boot.php"
 		]
 	},
diff --git a/doc/Addons.md b/doc/Addons.md
index 0382cee49..69b591a82 100644
--- a/doc/Addons.md
+++ b/doc/Addons.md
@@ -503,16 +503,6 @@ Here is a complete list of all hook callbacks with file locations (as of 24-Sep-
     Hook::callAll('item_photo_menu', $args);
     Hook::callAll('jot_tool', $jotplugins);
 
-### include/text.php
-
-    Hook::callAll('contact_block_end', $arr);
-    Hook::callAll('poke_verbs', $arr);
-    Hook::callAll('put_item_in_cache', $hook_data);
-    Hook::callAll('prepare_body_init', $item);
-    Hook::callAll('prepare_body_content_filter', $hook_data);
-    Hook::callAll('prepare_body', $hook_data);
-    Hook::callAll('prepare_body_final', $hook_data);
-
 ### include/items.php
 
     Hook::callAll('page_info_data', $data);
@@ -649,6 +639,11 @@ Here is a complete list of all hook callbacks with file locations (as of 24-Sep-
     Hook::callAll('post_remote_end', $posted_item);
     Hook::callAll('tagged', $arr);
     Hook::callAll('post_local_end', $new_item);
+    Hook::callAll('put_item_in_cache', $hook_data);
+    Hook::callAll('prepare_body_init', $item);
+    Hook::callAll('prepare_body_content_filter', $hook_data);
+    Hook::callAll('prepare_body', $hook_data);
+    Hook::callAll('prepare_body_final', $hook_data);
 
 ### src/Model/Contact.php
 
@@ -673,6 +668,10 @@ Here is a complete list of all hook callbacks with file locations (as of 24-Sep-
     Hook::callAll('register_account', $uid);
     Hook::callAll('remove_user', $user);
 
+### src/Content/ContactBlock.php
+
+    Hook::callAll('contact_block_end', $arr);
+
 ### src/Content/Text/BBCode.php
 
     Hook::callAll('bbcode', $text);
@@ -746,6 +745,10 @@ Here is a complete list of all hook callbacks with file locations (as of 24-Sep-
 
     self::callSingle(self::getApp(), 'hook_fork', $fork_hook, $hookdata);
 
+### src/Core/L10n/L10n.php
+
+    Hook::callAll('poke_verbs', $arr);
+
 ### src/Core/Worker.php
 
     Hook::callAll("proc_run", $arr);
diff --git a/doc/de/Addons.md b/doc/de/Addons.md
index 3cbbb4b0b..755db95d0 100644
--- a/doc/de/Addons.md
+++ b/doc/de/Addons.md
@@ -226,16 +226,6 @@ Eine komplette Liste aller Hook-Callbacks mit den zugehörigen Dateien (am 01-Ap
     Hook::callAll('item_photo_menu', $args);
     Hook::callAll('jot_tool', $jotplugins);
 
-### include/text.php
-
-    Hook::callAll('contact_block_end', $arr);
-    Hook::callAll('poke_verbs', $arr);
-    Hook::callAll('put_item_in_cache', $hook_data);
-    Hook::callAll('prepare_body_init', $item);
-    Hook::callAll('prepare_body_content_filter', $hook_data);
-    Hook::callAll('prepare_body', $hook_data);
-    Hook::callAll('prepare_body_final', $hook_data);
-
 ### include/items.php
 
     Hook::callAll('page_info_data', $data);
@@ -365,6 +355,11 @@ Eine komplette Liste aller Hook-Callbacks mit den zugehörigen Dateien (am 01-Ap
     Hook::callAll('post_remote_end', $posted_item);
     Hook::callAll('tagged', $arr);
     Hook::callAll('post_local_end', $new_item);
+    Hook::callAll('put_item_in_cache', $hook_data);
+    Hook::callAll('prepare_body_init', $item);
+    Hook::callAll('prepare_body_content_filter', $hook_data);
+    Hook::callAll('prepare_body', $hook_data);
+    Hook::callAll('prepare_body_final', $hook_data);
 
 ### src/Model/Contact.php
 
@@ -387,6 +382,10 @@ Eine komplette Liste aller Hook-Callbacks mit den zugehörigen Dateien (am 01-Ap
 
     Hook::callAll('register_account', $uid);
     Hook::callAll('remove_user', $user);
+    
+### src/Content/ContactBlock.php
+
+    Hook::callAll('contact_block_end', $arr);
 
 ### src/Content/Text/BBCode.php
 
@@ -457,6 +456,18 @@ Eine komplette Liste aller Hook-Callbacks mit den zugehörigen Dateien (am 01-Ap
     Hook::callAll($a->module.'_post_'.$selname, $o);
     Hook::callAll('jot_networks', $jotnets);
 
+### src/Core/Authentication.php
+
+    Hook::callAll('logged_in', $a->user);
+
+### src/Core/Hook.php
+
+    self::callSingle(self::getApp(), 'hook_fork', $fork_hook, $hookdata);
+
+### src/Core/L10n/L10n.php
+
+    Hook::callAll('poke_verbs', $arr);
+
 ### src/Core/Worker.php
 
     Hook::callAll("proc_run", $arr);
diff --git a/include/conversation.php b/include/conversation.php
index b6faa4d2c..8bcd1b338 100644
--- a/include/conversation.php
+++ b/include/conversation.php
@@ -4,8 +4,10 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
+use Friendica\Content\Item as ContentItem;
 use Friendica\Content\Pager;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Config;
@@ -24,6 +26,7 @@ use Friendica\Model\Profile;
 use Friendica\Model\Term;
 use Friendica\Object\Post;
 use Friendica\Object\Thread;
+use Friendica\Protocol\Activity;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Proxy as ProxyUtils;
 use Friendica\Util\Temporal;
@@ -138,12 +141,15 @@ function localize_item(&$item)
 	During the further steps of the database restructuring I would like to address this issue.
 	*/
 
+	/** @var Activity $activity */
+	$activity = BaseObject::getClass(Activity::class);
+
 	$xmlhead = "<" . "?xml version='1.0' encoding='UTF-8' ?" . ">";
-	if (activity_match($item['verb'], ACTIVITY_LIKE)
-		|| activity_match($item['verb'], ACTIVITY_DISLIKE)
-		|| activity_match($item['verb'], ACTIVITY_ATTEND)
-		|| activity_match($item['verb'], ACTIVITY_ATTENDNO)
-		|| activity_match($item['verb'], ACTIVITY_ATTENDMAYBE)) {
+	if ($activity->match($item['verb'], ACTIVITY_LIKE)
+		|| $activity->match($item['verb'], ACTIVITY_DISLIKE)
+		|| $activity->match($item['verb'], ACTIVITY_ATTEND)
+		|| $activity->match($item['verb'], ACTIVITY_ATTENDNO)
+		|| $activity->match($item['verb'], ACTIVITY_ATTENDMAYBE)) {
 
 		$fields = ['author-link', 'author-name', 'verb', 'object-type', 'resource-id', 'body', 'plink'];
 		$obj = Item::selectFirst($fields, ['uri' => $item['parent-uri']]);
@@ -178,22 +184,22 @@ function localize_item(&$item)
 		$plink = '[url=' . $obj['plink'] . ']' . $post_type . '[/url]';
 
 		$bodyverb = '';
-		if (activity_match($item['verb'], ACTIVITY_LIKE)) {
+		if ($activity->match($item['verb'], ACTIVITY_LIKE)) {
 			$bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
-		} elseif (activity_match($item['verb'], ACTIVITY_DISLIKE)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_DISLIKE)) {
 			$bodyverb = L10n::t('%1$s doesn\'t like %2$s\'s %3$s');
-		} elseif (activity_match($item['verb'], ACTIVITY_ATTEND)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_ATTEND)) {
 			$bodyverb = L10n::t('%1$s attends %2$s\'s %3$s');
-		} elseif (activity_match($item['verb'], ACTIVITY_ATTENDNO)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_ATTENDNO)) {
 			$bodyverb = L10n::t('%1$s doesn\'t attend %2$s\'s %3$s');
-		} elseif (activity_match($item['verb'], ACTIVITY_ATTENDMAYBE)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_ATTENDMAYBE)) {
 			$bodyverb = L10n::t('%1$s attends maybe %2$s\'s %3$s');
 		}
 
 		$item['body'] = sprintf($bodyverb, $author, $objauthor, $plink);
 	}
 
-	if (activity_match($item['verb'], ACTIVITY_FRIEND)) {
+	if ($activity->match($item['verb'], ACTIVITY_FRIEND)) {
 
 		if ($item['object-type']=="" || $item['object-type']!== ACTIVITY_OBJ_PERSON) return;
 
@@ -275,7 +281,7 @@ function localize_item(&$item)
 
 	}
 
-	if (activity_match($item['verb'], ACTIVITY_TAG)) {
+	if ($activity->match($item['verb'], ACTIVITY_TAG)) {
 		$fields = ['author-id', 'author-link', 'author-name', 'author-network',
 			'verb', 'object-type', 'resource-id', 'body', 'plink'];
 		$obj = Item::selectFirst($fields, ['uri' => $item['parent-uri']]);
@@ -320,7 +326,7 @@ function localize_item(&$item)
 		$item['body'] = L10n::t('%1$s tagged %2$s\'s %3$s with %4$s', $author, $objauthor, $plink, $tag);
 	}
 
-	if (activity_match($item['verb'], ACTIVITY_FAVORITE)) {
+	if ($activity->match($item['verb'], ACTIVITY_FAVORITE)) {
 		if ($item['object-type'] == "") {
 			return;
 		}
@@ -393,19 +399,22 @@ function count_descendants($item) {
 
 function visible_activity($item) {
 
+	/** @var Activity $activity */
+	$activity = BaseObject::getClass(Activity::class);
+
 	/*
 	 * likes (etc.) can apply to other things besides posts. Check if they are post children,
 	 * in which case we handle them specially
 	 */
 	$hidden_activities = [ACTIVITY_LIKE, ACTIVITY_DISLIKE, ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE, ACTIVITY_FOLLOW, ACTIVITY2_ANNOUNCE];
 	foreach ($hidden_activities as $act) {
-		if (activity_match($item['verb'], $act)) {
+		if ($activity->match($item['verb'], $act)) {
 			return false;
 		}
 	}
 
 	// @TODO below if() block can be rewritten to a single line: $isVisible = allConditionsHere;
-	if (activity_match($item['verb'], ACTIVITY_FOLLOW) && $item['object-type'] === ACTIVITY_OBJ_NOTE && empty($item['self']) && $item['uid'] == local_user()) {
+	if ($activity->match($item['verb'], ACTIVITY_FOLLOW) && $item['object-type'] === ACTIVITY_OBJ_NOTE && empty($item['self']) && $item['uid'] == local_user()) {
 		return false;
 	}
 
@@ -663,7 +672,10 @@ function conversation(App $a, array $items, Pager $pager, $mode, $update, $previ
 
 				$body = Item::prepareBody($item, true, $preview);
 
-				list($categories, $folders) = get_cats_and_terms($item);
+				/** @var ContentItem $contItem */
+				$contItem = BaseObject::getClass(ContentItem::class);
+
+				list($categories, $folders) = $contItem->determineCategoriesTerms($item);
 
 				if (!empty($item['content-warning']) && PConfig::get(local_user(), 'system', 'disable_cw', false)) {
 					$title = ucfirst($item['content-warning']);
@@ -1017,7 +1029,10 @@ function builtin_activity_puller($item, &$conv_responses) {
 				return;
 		}
 
-		if (activity_match($item['verb'], $verb) && ($item['id'] != $item['parent'])) {
+		/** @var Activity $activity */
+		$activity = BaseObject::getClass(Activity::class);
+
+		if ($activity->match($item['verb'], $verb) && ($item['id'] != $item['parent'])) {
 			$author = ['uid' => 0, 'id' => $item['author-id'],
 				'network' => $item['author-network'], 'url' => $item['author-link']];
 			$url = Contact::magicLinkByContact($author);
diff --git a/include/text.php b/include/text.php
deleted file mode 100644
index 2050e5702..000000000
--- a/include/text.php
+++ /dev/null
@@ -1,275 +0,0 @@
-<?php
-/**
- * @file include/text.php
- */
-
-use Friendica\App;
-use Friendica\Content\Text\BBCode;
-use Friendica\Core\Protocol;
-use Friendica\Model\Contact;
-use Friendica\Model\FileTag;
-use Friendica\Model\Group;
-use Friendica\Util\Strings;
-
-/**
- * Turn user/group ACLs stored as angle bracketed text into arrays
- *
- * @param string $s
- * @return array
- */
-function expand_acl($s) {
-	// turn string array of angle-bracketed elements into numeric array
-	// e.g. "<1><2><3>" => array(1,2,3);
-	preg_match_all('/<(' . Group::FOLLOWERS . '|'. Group::MUTUALS . '|[0-9]+)>/', $s, $matches, PREG_PATTERN_ORDER);
-
-	return $matches[1];
-}
-
-
-/**
- * Wrap ACL elements in angle brackets for storage
- * @param string $item
- */
-function sanitise_acl(&$item) {
-	if (intval($item)) {
-		$item = '<' . intval(Strings::escapeTags(trim($item))) . '>';
-	} elseif (in_array($item, [Group::FOLLOWERS, Group::MUTUALS])) {
-		$item = '<' . $item . '>';
-	} else {
-		unset($item);
-	}
-}
-
-
-/**
- * Convert an ACL array to a storable string
- *
- * Normally ACL permissions will be an array.
- * We'll also allow a comma-separated string.
- *
- * @param string|array $p
- * @return string
- */
-function perms2str($p) {
-	$ret = '';
-	if (is_array($p)) {
-		$tmp = $p;
-	} else {
-		$tmp = explode(',', $p);
-	}
-
-	if (is_array($tmp)) {
-		array_walk($tmp, 'sanitise_acl');
-		$ret = implode('', $tmp);
-	}
-	return $ret;
-}
-
-/**
- *  for html,xml parsing - let's say you've got
- *  an attribute foobar="class1 class2 class3"
- *  and you want to find out if it contains 'class3'.
- *  you can't use a normal sub string search because you
- *  might match 'notclass3' and a regex to do the job is
- *  possible but a bit complicated.
- *  pass the attribute string as $attr and the attribute you
- *  are looking for as $s - returns true if found, otherwise false
- *
- * @param string $attr attribute value
- * @param string $s string to search
- * @return boolean True if found, False otherwise
- */
-function attribute_contains($attr, $s) {
-	$a = explode(' ', $attr);
-	return (count($a) && in_array($s,$a));
-}
-
-/**
- * Compare activity uri. Knows about activity namespace.
- *
- * @param string $haystack
- * @param string $needle
- * @return boolean
- */
-function activity_match($haystack,$needle) {
-	return (($haystack === $needle) || ((basename($needle) === $haystack) && strstr($needle, NAMESPACE_ACTIVITY_SCHEMA)));
-}
-
-/**
- * quick and dirty quoted_printable encoding
- *
- * @param string $s
- * @return string
- */
-function qp($s) {
-	return str_replace("%", "=", rawurlencode($s));
-}
-
-/**
- * @brief Find any non-embedded images in private items and add redir links to them
- *
- * @param App $a
- * @param array &$item The field array of an item row
- */
-function redir_private_images($a, &$item)
-{
-	$matches = [];
-	$cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
-	if ($cnt) {
-		foreach ($matches as $mtch) {
-			if (strpos($mtch[1], '/redir') !== false) {
-				continue;
-			}
-
-			if ((local_user() == $item['uid']) && ($item['private'] == 1) && ($item['contact-id'] != $a->contact['id']) && ($item['network'] == Protocol::DFRN)) {
-				$img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
-				$item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
-			}
-		}
-	}
-}
-
-/**
- * @brief Given a text string, convert from bbcode to html and add smilie icons.
- *
- * @param string $text String with bbcode.
- * @return string Formatted HTML
- * @throws \Friendica\Network\HTTPException\InternalServerErrorException
- */
-function prepare_text($text)
-{
-	$s = BBCode::convert($text);
-	return trim($s);
-}
-
-/**
- * return array with details for categories and folders for an item
- *
- * @param array $item
- * @return array
- *
-  * [
- *      [ // categories array
- *          {
- *               'name': 'category name',
- *               'removeurl': 'url to remove this category',
- *               'first': 'is the first in this array? true/false',
- *               'last': 'is the last in this array? true/false',
- *           } ,
- *           ....
- *       ],
- *       [ //folders array
- *			{
- *               'name': 'folder name',
- *               'removeurl': 'url to remove this folder',
- *               'first': 'is the first in this array? true/false',
- *               'last': 'is the last in this array? true/false',
- *           } ,
- *           ....
- *       ]
- *  ]
- */
-function get_cats_and_terms($item)
-{
-	$categories = [];
-	$folders = [];
-	$first = true;
-
-	foreach (FileTag::fileToArray($item['file'] ?? '', 'category') as $savedFolderName) {
-		$categories[] = [
-			'name' => $savedFolderName,
-			'url' => "#",
-			'removeurl' => ((local_user() == $item['uid']) ? 'filerm/' . $item['id'] . '?f=&cat=' . rawurlencode($savedFolderName) : ""),
-			'first' => $first,
-			'last' => false
-		];
-		$first = false;
-	}
-
-	if (count($categories)) {
-		$categories[count($categories) - 1]['last'] = true;
-	}
-
-	if (local_user() == $item['uid']) {
-		foreach (FileTag::fileToArray($item['file'] ?? '') as $savedFolderName) {
-			$folders[] = [
-				'name' => $savedFolderName,
-				'url' => "#",
-				'removeurl' => ((local_user() == $item['uid']) ? 'filerm/' . $item['id'] . '?f=&term=' . rawurlencode($savedFolderName) : ""),
-				'first' => $first,
-				'last' => false
-			];
-			$first = false;
-		}
-	}
-
-	if (count($folders)) {
-		$folders[count($folders) - 1]['last'] = true;
-	}
-
-	return [$categories, $folders];
-}
-
-/**
- * return number of bytes in size (K, M, G)
- * @param string $size_str
- * @return int
- */
-function return_bytes($size_str) {
-	switch (substr ($size_str, -1)) {
-		case 'M': case 'm': return (int)$size_str * 1048576;
-		case 'K': case 'k': return (int)$size_str * 1024;
-		case 'G': case 'g': return (int)$size_str * 1073741824;
-		default: return $size_str;
-	}
-}
-
-function bb_translate_video($s) {
-
-	$matches = null;
-	$r = preg_match_all("/\[video\](.*?)\[\/video\]/ism",$s,$matches,PREG_SET_ORDER);
-	if ($r) {
-		foreach ($matches as $mtch) {
-			if ((stristr($mtch[1], 'youtube')) || (stristr($mtch[1], 'youtu.be'))) {
-				$s = str_replace($mtch[0], '[youtube]' . $mtch[1] . '[/youtube]', $s);
-			} elseif (stristr($mtch[1], 'vimeo')) {
-				$s = str_replace($mtch[0], '[vimeo]' . $mtch[1] . '[/vimeo]', $s);
-			}
-		}
-	}
-	return $s;
-}
-
-function undo_post_tagging($s) {
-	$matches = null;
-	$cnt = preg_match_all('/([!#@])\[url=(.*?)\](.*?)\[\/url\]/ism', $s, $matches, PREG_SET_ORDER);
-	if ($cnt) {
-		foreach ($matches as $mtch) {
-			if (in_array($mtch[1], ['!', '@'])) {
-				$contact = Contact::getDetailsByURL($mtch[2]);
-				$mtch[3] = empty($contact['addr']) ? $mtch[2] : $contact['addr'];
-			}
-			$s = str_replace($mtch[0], $mtch[1] . $mtch[3],$s);
-		}
-	}
-	return $s;
-}
-
-/// @TODO Rewrite this
-function is_a_date_arg($s) {
-	$i = intval($s);
-
-	if ($i > 1900) {
-		$y = date('Y');
-
-		if ($i <= $y + 1 && strpos($s, '-') == 4) {
-			$m = intval(substr($s, 5));
-
-			if ($m > 0 && $m <= 12) {
-				return true;
-			}
-		}
-	}
-
-	return false;
-}
diff --git a/mod/editpost.php b/mod/editpost.php
index e14baffa2..690cb2ac0 100644
--- a/mod/editpost.php
+++ b/mod/editpost.php
@@ -8,9 +8,10 @@ use Friendica\Content\Feature;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
+use Friendica\Database\DBA;
+use Friendica\Model\Contact;
 use Friendica\Model\FileTag;
 use Friendica\Model\Item;
-use Friendica\Database\DBA;
 use Friendica\Util\Crypto;
 
 function editpost_content(App $a)
@@ -118,3 +119,18 @@ function editpost_content(App $a)
 
 	return $o;
 }
+
+function undo_post_tagging($s) {
+	$matches = null;
+	$cnt = preg_match_all('/([!#@])\[url=(.*?)\](.*?)\[\/url\]/ism', $s, $matches, PREG_SET_ORDER);
+	if ($cnt) {
+		foreach ($matches as $mtch) {
+			if (in_array($mtch[1], ['!', '@'])) {
+				$contact = Contact::getDetailsByURL($mtch[2]);
+				$mtch[3] = empty($contact['addr']) ? $mtch[2] : $contact['addr'];
+			}
+			$s = str_replace($mtch[0], $mtch[1] . $mtch[3],$s);
+		}
+	}
+	return $s;
+}
diff --git a/mod/events.php b/mod/events.php
index 649a25ab1..11bb25f51 100644
--- a/mod/events.php
+++ b/mod/events.php
@@ -5,6 +5,7 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Content\Nav;
 use Friendica\Content\Widget\CalendarExport;
 use Friendica\Core\ACL;
@@ -18,6 +19,7 @@ use Friendica\Model\Event;
 use Friendica\Model\Item;
 use Friendica\Model\Profile;
 use Friendica\Module\Login;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Strings;
 use Friendica\Util\Temporal;
@@ -146,10 +148,14 @@ function events_post(App $a)
 
 
 	if ($share) {
-		$str_group_allow   = perms2str($_POST['group_allow']   ?? '');
-		$str_contact_allow = perms2str($_POST['contact_allow'] ?? '');
-		$str_group_deny    = perms2str($_POST['group_deny']    ?? '');
-		$str_contact_deny  = perms2str($_POST['contact_deny']  ?? '');
+
+		/** @var ACLFormatter $aclFormatter */
+		$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+		$str_group_allow   = $aclFormatter->toString($_POST['group_allow'] ?? '');
+		$str_contact_allow = $aclFormatter->toString($_POST['contact_allow'] ?? '');
+		$str_group_deny    = $aclFormatter->toString($_POST['group_deny'] ?? '');
+		$str_contact_deny  = $aclFormatter->toString($_POST['contact_deny'] ?? '');
 
 		// Undo the pseudo-contact of self, since there are real contacts now
 		if (strpos($str_contact_allow, '<' . $self . '>') !== false) {
diff --git a/mod/item.php b/mod/item.php
index 7c8ebee4a..a5875d258 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -16,6 +16,7 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Content\Pager;
 use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\HTML;
@@ -24,8 +25,8 @@ use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
-use Friendica\Core\System;
 use Friendica\Core\Session;
+use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\Model\Attach;
@@ -37,6 +38,7 @@ use Friendica\Model\Photo;
 use Friendica\Model\Term;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\Email;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Emailer;
 use Friendica\Util\Security;
@@ -269,10 +271,14 @@ function item_post(App $a) {
 			$str_contact_deny  = $user['deny_cid'];
 		} else {
 			// use the posted permissions
-			$str_group_allow   = perms2str($_REQUEST['group_allow'] ?? '');
-			$str_contact_allow = perms2str($_REQUEST['contact_allow'] ?? '');
-			$str_group_deny    = perms2str($_REQUEST['group_deny'] ?? '');
-			$str_contact_deny  = perms2str($_REQUEST['contact_deny'] ?? '');
+
+			/** @var ACLFormatter $aclFormatter */
+			$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+			$str_group_allow   = $aclFormatter->toString($_REQUEST['group_allow'] ?? '');
+			$str_contact_allow = $aclFormatter->toString($_REQUEST['contact_allow'] ?? '');
+			$str_group_deny    = $aclFormatter->toString($_REQUEST['group_deny'] ?? '');
+			$str_contact_deny  = $aclFormatter->toString($_REQUEST['contact_deny'] ?? '');
 		}
 
 		$title             = Strings::escapeTags(trim($_REQUEST['title']    ?? ''));
@@ -499,8 +505,9 @@ function item_post(App $a) {
 		$objecttype = ACTIVITY_OBJ_BOOKMARK;
 	}
 
-	$body = bb_translate_video($body);
-
+	/** @var BBCode\Video $bbCodeVideo */
+	$bbCodeVideo = BaseObject::getClass(BBCode\Video::class);
+	$body =  $bbCodeVideo->transform($body);
 
 	// Fold multi-line [code] sequences
 	$body = preg_replace('/\[\/code\]\s*\[code\]/ism', "\n", $body);
diff --git a/mod/lockview.php b/mod/lockview.php
index eede1b6a0..9f9dcfea4 100644
--- a/mod/lockview.php
+++ b/mod/lockview.php
@@ -3,11 +3,13 @@
  * @file mod/lockview.php
  */
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Database\DBA;
 use Friendica\Model\Group;
 use Friendica\Model\Item;
+use Friendica\Util\ACLFormatter;
 
 function lockview_content(App $a)
 {
@@ -59,10 +61,13 @@ function lockview_content(App $a)
 		exit();
 	}
 
-	$allowed_users  = expand_acl($item['allow_cid']);
-	$allowed_groups = expand_acl($item['allow_gid']);
-	$deny_users     = expand_acl($item['deny_cid']);
-	$deny_groups    = expand_acl($item['deny_gid']);
+	/** @var ACLFormatter $aclFormatter */
+	$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+	$allowed_users = $aclFormatter->expand($item['allow_cid']);
+	$allowed_groups = $aclFormatter->expand($item['allow_gid']);
+	$deny_users = $aclFormatter->expand($item['deny_cid']);
+	$deny_groups = $aclFormatter->expand($item['deny_gid']);
 
 	$o = L10n::t('Visible to:') . '<br />';
 	$l = [];
diff --git a/mod/network.php b/mod/network.php
index 0438be705..64f5cf505 100644
--- a/mod/network.php
+++ b/mod/network.php
@@ -5,6 +5,7 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Content\Feature;
 use Friendica\Content\ForumManager;
 use Friendica\Content\Nav;
@@ -51,9 +52,12 @@ function network_init(App $a)
 		$group_id = 0;
 	}
 
+	/** @var DateTimeFormat $dtFormat */
+	$dtFormat = BaseObject::getClass(DateTimeFormat::class);
+
 	if ($a->argc > 1) {
 		for ($x = 1; $x < $a->argc; $x ++) {
-			if (is_a_date_arg($a->argv[$x])) {
+			if ($dtFormat->isYearMonth($a->argv[$x])) {
 				$is_a_date_query = true;
 				break;
 			}
@@ -461,9 +465,12 @@ function networkThreadedView(App $a, $update, $parent)
 
 	$default_permissions = [];
 
+	/** @var DateTimeFormat $dtFormat */
+	$dtFormat = BaseObject::getClass(DateTimeFormat::class);
+
 	if ($a->argc > 1) {
 		for ($x = 1; $x < $a->argc; $x ++) {
-			if (is_a_date_arg($a->argv[$x])) {
+			if ($dtFormat->isYearMonth($a->argv[$x])) {
 				if ($datequery) {
 					$datequery2 = Strings::escapeHtml($a->argv[$x]);
 				} else {
diff --git a/mod/photos.php b/mod/photos.php
index 1789c0710..d89cd04b0 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -4,6 +4,7 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Content\Feature;
 use Friendica\Content\Nav;
 use Friendica\Content\Pager;
@@ -14,18 +15,17 @@ use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
 use Friendica\Core\Renderer;
-use Friendica\Core\System;
 use Friendica\Core\Session;
+use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Model\Contact;
-use Friendica\Model\Group;
 use Friendica\Model\Item;
 use Friendica\Model\Photo;
 use Friendica\Model\Profile;
 use Friendica\Model\User;
 use Friendica\Network\Probe;
 use Friendica\Object\Image;
-use Friendica\Protocol\DFRN;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\Crypto;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Map;
@@ -296,10 +296,13 @@ function photos_post(App $a)
 		$albname     = !empty($_POST['albname'])   ? Strings::escapeTags(trim($_POST['albname']))   : '';
 		$origaname   = !empty($_POST['origaname']) ? Strings::escapeTags(trim($_POST['origaname'])) : '';
 
-		$str_group_allow   = !empty($_POST['group_allow'])   ? perms2str($_POST['group_allow'])   : '';
-		$str_contact_allow = !empty($_POST['contact_allow']) ? perms2str($_POST['contact_allow']) : '';
-		$str_group_deny    = !empty($_POST['group_deny'])    ? perms2str($_POST['group_deny'])    : '';
-		$str_contact_deny  = !empty($_POST['contact_deny'])  ? perms2str($_POST['contact_deny'])  : '';
+		/** @var ACLFormatter $aclFormatter */
+		$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+		$str_group_allow   = !empty($_POST['group_allow'])   ? $aclFormatter->toString($_POST['group_allow'])   : '';
+		$str_contact_allow = !empty($_POST['contact_allow']) ? $aclFormatter->toString($_POST['contact_allow']) : '';
+		$str_group_deny    = !empty($_POST['group_deny'])    ? $aclFormatter->toString($_POST['group_deny'])    : '';
+		$str_contact_deny  = !empty($_POST['contact_deny'])  ? $aclFormatter->toString($_POST['contact_deny'])  : '';
 
 		$resource_id = $a->argv[3];
 
@@ -635,10 +638,13 @@ function photos_post(App $a)
 	$group_deny    = $_REQUEST['group_deny']    ?? [];
 	$contact_deny  = $_REQUEST['contact_deny']  ?? [];
 
-	$str_group_allow   = perms2str(is_array($group_allow)   ? $group_allow   : explode(',', $group_allow));
-	$str_contact_allow = perms2str(is_array($contact_allow) ? $contact_allow : explode(',', $contact_allow));
-	$str_group_deny    = perms2str(is_array($group_deny)    ? $group_deny    : explode(',', $group_deny));
-	$str_contact_deny  = perms2str(is_array($contact_deny)  ? $contact_deny  : explode(',', $contact_deny));
+	/** @var ACLFormatter $aclFormatter */
+	$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+	$str_group_allow   = $aclFormatter->toString(is_array($group_allow)   ? $group_allow   : explode(',', $group_allow));
+	$str_contact_allow = $aclFormatter->toString(is_array($contact_allow) ? $contact_allow : explode(',', $contact_allow));
+	$str_group_deny    = $aclFormatter->toString(is_array($group_deny)    ? $group_deny    : explode(',', $group_deny));
+	$str_contact_deny  = $aclFormatter->toString(is_array($contact_deny)  ? $contact_deny  : explode(',', $contact_deny));
 
 	$ret = ['src' => '', 'filename' => '', 'filesize' => 0, 'type' => ''];
 
@@ -1438,7 +1444,12 @@ function photos_content(App $a)
 					$template = $tpl;
 					$sparkle = '';
 
-					if ((activity_match($item['verb'], ACTIVITY_LIKE) || activity_match($item['verb'], ACTIVITY_DISLIKE)) && ($item['id'] != $item['parent'])) {
+					/** @var \Friendica\Protocol\Activity $activity */
+					$activity = BaseObject::getClass(\Friendica\Protocol\Activity::class);
+
+					if (($activity->match($item['verb'], ACTIVITY_LIKE) ||
+					     $activity->match($item['verb'], ACTIVITY_DISLIKE)) &&
+					    ($item['id'] != $item['parent'])) {
 						continue;
 					}
 
diff --git a/mod/settings.php b/mod/settings.php
index b5011881c..8c3ce6684 100644
--- a/mod/settings.php
+++ b/mod/settings.php
@@ -5,6 +5,7 @@
 
 use Friendica\App;
 use Friendica\BaseModule;
+use Friendica\BaseObject;
 use Friendica\Content\Feature;
 use Friendica\Content\Nav;
 use Friendica\Core\ACL;
@@ -25,6 +26,7 @@ use Friendica\Model\Group;
 use Friendica\Model\User;
 use Friendica\Module\Login;
 use Friendica\Protocol\Email;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\Network;
 use Friendica\Util\Strings;
 use Friendica\Util\Temporal;
@@ -533,10 +535,13 @@ function settings_post(App $a)
 		date_default_timezone_set($timezone);
 	}
 
-	$str_group_allow   = !empty($_POST['group_allow'])   ? perms2str($_POST['group_allow'])   : '';
-	$str_contact_allow = !empty($_POST['contact_allow']) ? perms2str($_POST['contact_allow']) : '';
-	$str_group_deny    = !empty($_POST['group_deny'])    ? perms2str($_POST['group_deny'])    : '';
-	$str_contact_deny  = !empty($_POST['contact_deny'])  ? perms2str($_POST['contact_deny'])  : '';
+	/** @var ACLFormatter $aclFormatter */
+	$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+	$str_group_allow   = !empty($_POST['group_allow'])   ? $aclFormatter->toString($_POST['group_allow'])   : '';
+	$str_contact_allow = !empty($_POST['contact_allow']) ? $aclFormatter->toString($_POST['contact_allow']) : '';
+	$str_group_deny    = !empty($_POST['group_deny'])    ? $aclFormatter->toString($_POST['group_deny'])    : '';
+	$str_contact_deny  = !empty($_POST['contact_deny'])  ? $aclFormatter->toString($_POST['contact_deny'])  : '';
 
 	$openidserver = $a->user['openidserver'];
 	//$openid = Strings::normaliseOpenID($openid);
diff --git a/src/BaseObject.php b/src/BaseObject.php
index 996824f4a..204818845 100644
--- a/src/BaseObject.php
+++ b/src/BaseObject.php
@@ -54,7 +54,7 @@ class BaseObject
 	 *
 	 * @throws InternalServerErrorException
 	 */
-	protected static function getClass(string $name)
+	public static function getClass(string $name)
 	{
 		if (empty(self::$dice)) {
 			throw new InternalServerErrorException('DICE isn\'t initialized.');
diff --git a/src/Content/Item.php b/src/Content/Item.php
new file mode 100644
index 000000000..ed6ec9c87
--- /dev/null
+++ b/src/Content/Item.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace Friendica\Content;
+
+use Friendica\Model\FileTag;
+
+/**
+ * A content helper class for displaying items
+ */
+final class Item
+{
+	/**
+	 * Return array with details for categories and folders for an item
+	 *
+	 * @param array $item
+	 * @return [array, array]
+	 *
+	 * [
+	 *      [ // categories array
+	 *          {
+	 *               'name': 'category name',
+	 *               'removeurl': 'url to remove this category',
+	 *               'first': 'is the first in this array? true/false',
+	 *               'last': 'is the last in this array? true/false',
+	 *           } ,
+	 *           ....
+	 *       ],
+	 *       [ //folders array
+	 *			{
+	 *               'name': 'folder name',
+	 *               'removeurl': 'url to remove this folder',
+	 *               'first': 'is the first in this array? true/false',
+	 *               'last': 'is the last in this array? true/false',
+	 *           } ,
+	 *           ....
+	 *       ]
+	 *  ]
+	 */
+	public function determineCategoriesTerms(array $item)
+	{
+		$categories = [];
+		$folders = [];
+		$first = true;
+
+		foreach (FileTag::fileToArray($item['file'] ?? '', 'category') as $savedFolderName) {
+			$categories[] = [
+				'name' => $savedFolderName,
+				'url' => "#",
+				'removeurl' => ((local_user() == $item['uid']) ? 'filerm/' . $item['id'] . '?f=&cat=' . rawurlencode($savedFolderName) : ""),
+				'first' => $first,
+				'last' => false
+			];
+			$first = false;
+		}
+
+		if (count($categories)) {
+			$categories[count($categories) - 1]['last'] = true;
+		}
+
+		if (local_user() == $item['uid']) {
+			foreach (FileTag::fileToArray($item['file'] ?? '') as $savedFolderName) {
+				$folders[] = [
+					'name' => $savedFolderName,
+					'url' => "#",
+					'removeurl' => ((local_user() == $item['uid']) ? 'filerm/' . $item['id'] . '?f=&term=' . rawurlencode($savedFolderName) : ""),
+					'first' => $first,
+					'last' => false
+				];
+				$first = false;
+			}
+		}
+
+		if (count($folders)) {
+			$folders[count($folders) - 1]['last'] = true;
+		}
+
+		return [$categories, $folders];
+	}
+}
diff --git a/src/Content/Text/BBCode/Video.php b/src/Content/Text/BBCode/Video.php
new file mode 100644
index 000000000..b73ddce0b
--- /dev/null
+++ b/src/Content/Text/BBCode/Video.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Friendica\Content\Text\BBCode;
+
+/**
+ * Video specific BBCode util class
+ */
+final class Video
+{
+	/**
+	 * Transforms video BBCode tagged links to youtube/vimeo tagged links
+	 *
+	 * @param string $bbCodeString The input BBCode styled string
+	 *
+	 * @return string The transformed text
+	 */
+	public function transform(string $bbCodeString)
+	{
+		$matches = null;
+		$found = preg_match_all("/\[video\](.*?)\[\/video\]/ism",$bbCodeString,$matches,PREG_SET_ORDER);
+		if ($found) {
+			foreach ($matches as $match) {
+				if ((stristr($match[1], 'youtube')) || (stristr($match[1], 'youtu.be'))) {
+					$bbCodeString = str_replace($match[0], '[youtube]' . $match[1] . '[/youtube]', $bbCodeString);
+				} elseif (stristr($match[1], 'vimeo')) {
+					$bbCodeString = str_replace($match[0], '[vimeo]' . $match[1] . '[/vimeo]', $bbCodeString);
+				}
+			}
+		}
+		return $bbCodeString;
+	}
+}
diff --git a/src/Model/Event.php b/src/Model/Event.php
index 915218084..cbd245a23 100644
--- a/src/Model/Event.php
+++ b/src/Model/Event.php
@@ -911,7 +911,7 @@ class Event extends BaseObject
 		$tpl = Renderer::getMarkupTemplate('event_stream_item.tpl');
 		$return = Renderer::replaceMacros($tpl, [
 			'$id'             => $item['event-id'],
-			'$title'          => prepare_text($item['event-summary']),
+			'$title'          => BBCode::convert($item['event-summary']),
 			'$dtstart_label'  => L10n::t('Starts:'),
 			'$dtstart_title'  => $dtstart_title,
 			'$dtstart_dt'     => $dtstart_dt,
@@ -929,7 +929,7 @@ class Event extends BaseObject
 			'$author_name'    => $item['author-name'],
 			'$author_link'    => $profile_link,
 			'$author_avatar'  => $item['author-avatar'],
-			'$description'    => prepare_text($item['event-desc']),
+			'$description'    => BBCode::convert($item['event-desc']),
 			'$location_label' => L10n::t('Location:'),
 			'$show_map_label' => L10n::t('Show map'),
 			'$hide_map_label' => L10n::t('Hide map'),
@@ -979,7 +979,7 @@ class Event extends BaseObject
 			}
 		}
 
-		$location['name'] = prepare_text($location['name']);
+		$location['name'] = BBCode::convert($location['name']);
 
 		// Construct the map HTML.
 		if (isset($location['address'])) {
diff --git a/src/Model/Item.php b/src/Model/Item.php
index ff0f46676..2c544a263 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -17,13 +17,15 @@ use Friendica\Core\Logger;
 use Friendica\Core\PConfig;
 use Friendica\Core\Protocol;
 use Friendica\Core\Renderer;
-use Friendica\Core\System;
 use Friendica\Core\Session;
+use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
+use Friendica\Protocol\Activity;
 use Friendica\Protocol\ActivityPub;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\OStatus;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Map;
 use Friendica\Util\Network;
@@ -1357,13 +1359,16 @@ class Item extends BaseObject
 			$item['parent-uri'] = $item['thr-parent'];
 		}
 
+		/** @var Activity $activity */
+		$activity = self::getClass(Activity::class);
+
 		if (isset($item['gravity'])) {
 			$item['gravity'] = intval($item['gravity']);
 		} elseif ($item['parent-uri'] === $item['uri']) {
 			$item['gravity'] = GRAVITY_PARENT;
-		} elseif (activity_match($item['verb'], ACTIVITY_POST)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_POST)) {
 			$item['gravity'] = GRAVITY_COMMENT;
-		} elseif (activity_match($item['verb'], ACTIVITY_FOLLOW)) {
+		} elseif ($activity->match($item['verb'], ACTIVITY_FOLLOW)) {
 			$item['gravity'] = GRAVITY_ACTIVITY;
 		} else {
 			$item['gravity'] = GRAVITY_UNKNOWN;   // Should not happen
@@ -2892,10 +2897,13 @@ class Item extends BaseObject
 	 */
 	public static function enumeratePermissions(array $obj, bool $check_dead = false)
 	{
-		$allow_people = expand_acl($obj['allow_cid']);
-		$allow_groups = Group::expand($obj['uid'], expand_acl($obj['allow_gid']), $check_dead);
-		$deny_people  = expand_acl($obj['deny_cid']);
-		$deny_groups  = Group::expand($obj['uid'], expand_acl($obj['deny_gid']), $check_dead);
+		/** @var ACLFormatter $aclFormater */
+		$aclFormater = self::getClass(ACLFormatter::class);
+
+		$allow_people = $aclFormater->expand($obj['allow_cid']);
+		$allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
+		$deny_people  = $aclFormater->expand($obj['deny_cid']);
+		$deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
 		$recipients   = array_unique(array_merge($allow_people, $allow_groups));
 		$deny         = array_unique(array_merge($deny_people, $deny_groups));
 		$recipients   = array_diff($recipients, $deny);
@@ -3342,10 +3350,9 @@ class Item extends BaseObject
 			|| $rendered_hash != hash("md5", $item["body"])
 			|| Config::get("system", "ignore_cache")
 		) {
-			$a = self::getApp();
-			redir_private_images($a, $item);
+			self::addRedirToImageTags($item);
 
-			$item["rendered-html"] = prepare_text($item["body"]);
+			$item["rendered-html"] = BBCode::convert($item["body"]);
 			$item["rendered-hash"] = hash("md5", $item["body"]);
 
 			$hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
@@ -3378,6 +3385,31 @@ class Item extends BaseObject
 		$item["body"] = $body;
 	}
 
+	/**
+	 * @brief Find any non-embedded images in private items and add redir links to them
+	 *
+	 * @param array &$item The field array of an item row
+	 */
+	private static function addRedirToImageTags(array &$item)
+	{
+		$app = self::getApp();
+
+		$matches = [];
+		$cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
+		if ($cnt) {
+			foreach ($matches as $mtch) {
+				if (strpos($mtch[1], '/redir') !== false) {
+					continue;
+				}
+
+				if ((local_user() == $item['uid']) && ($item['private'] == 1) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
+					$img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
+					$item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
+				}
+			}
+		}
+	}
+
 	/**
 	 * @brief Given an item array, convert the body element from bbcode to html and add smilie icons.
 	 * If attach is true, also add icons for item attachments.
diff --git a/src/Model/Profile.php b/src/Model/Profile.php
index b69860edf..de3290389 100644
--- a/src/Model/Profile.php
+++ b/src/Model/Profile.php
@@ -823,51 +823,51 @@ class Profile
 				$profile['religion'] = [L10n::t('Religion:'), $a->profile['religion']];
 			}
 
-			if ($txt = prepare_text($a->profile['about'])) {
+			if ($txt = BBCode::convert($a->profile['about'])) {
 				$profile['about'] = [L10n::t('About:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['interest'])) {
+			if ($txt = BBCode::convert($a->profile['interest'])) {
 				$profile['interest'] = [L10n::t('Hobbies/Interests:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['likes'])) {
+			if ($txt = BBCode::convert($a->profile['likes'])) {
 				$profile['likes'] = [L10n::t('Likes:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['dislikes'])) {
+			if ($txt = BBCode::convert($a->profile['dislikes'])) {
 				$profile['dislikes'] = [L10n::t('Dislikes:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['contact'])) {
+			if ($txt = BBCode::convert($a->profile['contact'])) {
 				$profile['contact'] = [L10n::t('Contact information and Social Networks:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['music'])) {
+			if ($txt = BBCode::convert($a->profile['music'])) {
 				$profile['music'] = [L10n::t('Musical interests:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['book'])) {
+			if ($txt = BBCode::convert($a->profile['book'])) {
 				$profile['book'] = [L10n::t('Books, literature:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['tv'])) {
+			if ($txt = BBCode::convert($a->profile['tv'])) {
 				$profile['tv'] = [L10n::t('Television:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['film'])) {
+			if ($txt = BBCode::convert($a->profile['film'])) {
 				$profile['film'] = [L10n::t('Film/dance/culture/entertainment:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['romance'])) {
+			if ($txt = BBCode::convert($a->profile['romance'])) {
 				$profile['romance'] = [L10n::t('Love/Romance:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['work'])) {
+			if ($txt = BBCode::convert($a->profile['work'])) {
 				$profile['work'] = [L10n::t('Work/employment:'), $txt];
 			}
 
-			if ($txt = prepare_text($a->profile['education'])) {
+			if ($txt = BBCode::convert($a->profile['education'])) {
 				$profile['education'] = [L10n::t('School/education:'), $txt];
 			}
 
diff --git a/src/Module/Item/Compose.php b/src/Module/Item/Compose.php
index 11b886a2e..c44e4c61a 100644
--- a/src/Module/Item/Compose.php
+++ b/src/Module/Item/Compose.php
@@ -16,6 +16,7 @@ use Friendica\Model\Item;
 use Friendica\Model\User;
 use Friendica\Module\Login;
 use Friendica\Network\HTTPException\NotImplementedException;
+use Friendica\Util\ACLFormatter;
 use Friendica\Util\Crypto;
 
 class Compose extends BaseModule
@@ -58,6 +59,9 @@ class Compose extends BaseModule
 
 		$user = User::getById(local_user(), ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'hidewall', 'default-location']);
 
+		/** @var ACLFormatter $aclFormatter */
+		$aclFormatter = self::getClass(ACLFormatter::class);
+
 		switch ($posttype) {
 			case Item::PT_PERSONAL_NOTE:
 				$compose_title = L10n::t('Compose new personal note');
@@ -70,8 +74,8 @@ class Compose extends BaseModule
 				$compose_title = L10n::t('Compose new post');
 				$type = 'post';
 				$doesFederate = true;
-				$contact_allow = implode(',', expand_acl($user['allow_cid']));
-				$group_allow = implode(',', expand_acl($user['allow_gid'])) ?: Group::FOLLOWERS;
+				$contact_allow = implode(',', $aclFormatter->expand($user['allow_cid']));
+				$group_allow = implode(',', $aclFormatter->expand($user['allow_gid'])) ?: Group::FOLLOWERS;
 				break;
 		}
 
@@ -82,8 +86,8 @@ class Compose extends BaseModule
 		$wall          = $_REQUEST['wall']          ?? $type == 'post';
 		$contact_allow = $_REQUEST['contact_allow'] ?? $contact_allow;
 		$group_allow   = $_REQUEST['group_allow']   ?? $group_allow;
-		$contact_deny  = $_REQUEST['contact_deny']  ?? implode(',', expand_acl($user['deny_cid']));
-		$group_deny    = $_REQUEST['group_deny']    ?? implode(',', expand_acl($user['deny_gid']));
+		$contact_deny  = $_REQUEST['contact_deny']  ?? implode(',', $aclFormatter->expand($user['deny_cid']));
+		$group_deny    = $_REQUEST['group_deny']    ?? implode(',', $aclFormatter->expand($user['deny_gid']));
 		$visibility    = ($contact_allow . $user['allow_gid'] . $user['deny_cid'] . $user['deny_gid']) ? 'custom' : 'public';
 
 		$acl_contacts = Contact::selectToArray(['id', 'name', 'addr', 'micro'], ['uid' => local_user(), 'pending' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]]);
diff --git a/src/Module/Profile.php b/src/Module/Profile.php
index ed3754075..f38c77f2c 100644
--- a/src/Module/Profile.php
+++ b/src/Module/Profile.php
@@ -131,9 +131,12 @@ class Profile extends BaseModule
 
 		$category = $datequery = $datequery2 = '';
 
+		/** @var DateTimeFormat $dtFormat */
+		$dtFormat = self::getClass(DateTimeFormat::class);
+
 		if ($a->argc > 2) {
 			for ($x = 2; $x < $a->argc; $x ++) {
-				if (is_a_date_arg($a->argv[$x])) {
+				if ($dtFormat->isYearMonth($a->argv[$x])) {
 					if ($datequery) {
 						$datequery2 = Strings::escapeHtml($a->argv[$x]);
 					} else {
diff --git a/src/Object/Post.php b/src/Object/Post.php
index 04775bbd0..7dd530801 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -7,6 +7,7 @@ namespace Friendica\Object;
 use Friendica\BaseObject;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
+use Friendica\Content\Item as ContentItem;
 use Friendica\Core\Addon;
 use Friendica\Core\Config;
 use Friendica\Core\Hook;
@@ -21,6 +22,7 @@ use Friendica\Model\Contact;
 use Friendica\Model\Item;
 use Friendica\Model\Term;
 use Friendica\Model\User;
+use Friendica\Protocol\Activity;
 use Friendica\Util\Crypto;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Proxy as ProxyUtils;
@@ -323,7 +325,10 @@ class Post extends BaseObject
 
 		$body = Item::prepareBody($item, true);
 
-		list($categories, $folders) = get_cats_and_terms($item);
+		/** @var ContentItem $contItem */
+		$contItem = self::getClass(ContentItem::class);
+
+		list($categories, $folders) = $contItem->determineCategoriesTerms($item);
 
 		$body_e       = $body;
 		$text_e       = strip_tags($body);
@@ -517,12 +522,17 @@ class Post extends BaseObject
 			Logger::log('[WARN] Post::addChild : Item already exists (' . $item->getId() . ').', Logger::DEBUG);
 			return false;
 		}
+
+		/** @var Activity $activity */
+		$activity = self::getClass(Activity::class);
+
 		/*
 		 * Only add what will be displayed
 		 */
 		if ($item->getDataValue('network') === Protocol::MAIL && local_user() != $item->getDataValue('uid')) {
 			return false;
-		} elseif (activity_match($item->getDataValue('verb'), ACTIVITY_LIKE) || activity_match($item->getDataValue('verb'), ACTIVITY_DISLIKE)) {
+		} elseif ($activity->match($item->getDataValue('verb'), ACTIVITY_LIKE) ||
+		          $activity->match($item->getDataValue('verb'), ACTIVITY_DISLIKE)) {
 			return false;
 		}
 
diff --git a/src/Protocol/Activity.php b/src/Protocol/Activity.php
new file mode 100644
index 000000000..64253b065
--- /dev/null
+++ b/src/Protocol/Activity.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Friendica\Protocol;
+
+/**
+ * Base class for the Activity namespace
+ */
+final class Activity
+{
+	/**
+	 * Compare activity uri. Knows about activity namespace.
+	 *
+	 * @param string $haystack
+	 * @param string $needle
+	 *
+	 * @return boolean
+	 */
+	public function match(string $haystack, string $needle) {
+		return (($haystack === $needle) ||
+		        ((basename($needle) === $haystack) &&
+		         strstr($needle, NAMESPACE_ACTIVITY_SCHEMA)));
+	}
+}
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index d557af069..e1901011e 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -12,6 +12,7 @@ use DOMDocument;
 use DOMXPath;
 use Friendica\App;
 use Friendica\App\BaseURL;
+use Friendica\BaseObject;
 use Friendica\Content\OEmbed;
 use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\HTML;
@@ -2180,24 +2181,27 @@ class DFRN
 			// The functions below are partly used by ostatus.php as well - where we have this variable
 			$contact = Contact::selectFirst([], ['id' => $importer['id']]);
 
+			/** @var Activity $activity */
+			$activity = BaseObject::getClass(Activity::class);
+
 			// Big question: Do we need these functions? They were part of the "consume_feed" function.
 			// This function once was responsible for DFRN and OStatus.
-			if (activity_match($item["verb"], ACTIVITY_FOLLOW)) {
+			if ($activity->match($item["verb"], ACTIVITY_FOLLOW)) {
 				Logger::log("New follower");
 				Contact::addRelationship($importer, $contact, $item);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_UNFOLLOW)) {
+			if ($activity->match($item["verb"], ACTIVITY_UNFOLLOW)) {
 				Logger::log("Lost follower");
 				Contact::removeFollower($importer, $contact, $item);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_REQ_FRIEND)) {
+			if ($activity->match($item["verb"], ACTIVITY_REQ_FRIEND)) {
 				Logger::log("New friend request");
 				Contact::addRelationship($importer, $contact, $item, true);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_UNFRIEND)) {
+			if ($activity->match($item["verb"], ACTIVITY_UNFRIEND)) {
 				Logger::log("Lost sharer");
 				Contact::removeSharer($importer, $contact, $item);
 				return false;
diff --git a/src/Util/ACLFormatter.php b/src/Util/ACLFormatter.php
new file mode 100644
index 000000000..1fb778761
--- /dev/null
+++ b/src/Util/ACLFormatter.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace Friendica\Util;
+
+use Friendica\Model\Group;
+
+/**
+ * Util class for ACL formatting
+ */
+final class ACLFormatter
+{
+	/**
+	 * Turn user/group ACLs stored as angle bracketed text into arrays
+	 *
+	 * @param string $ids A angle-bracketed list of IDs
+	 *
+	 * @return array The array based on the IDs
+	 */
+	public function expand(string $ids)
+	{
+		// turn string array of angle-bracketed elements into numeric array
+		// e.g. "<1><2><3>" => array(1,2,3);
+		preg_match_all('/<(' . Group::FOLLOWERS . '|'. Group::MUTUALS . '|[0-9]+)>/', $ids, $matches, PREG_PATTERN_ORDER);
+
+		return $matches[1];
+	}
+
+	/**
+	 * Wrap ACL elements in angle brackets for storage
+	 *
+	 * @param string $item The item to sanitise
+	 */
+	private function sanitize(string &$item) {
+		if (intval($item)) {
+			$item = '<' . intval(Strings::escapeTags(trim($item))) . '>';
+		} elseif (in_array($item, [Group::FOLLOWERS, Group::MUTUALS])) {
+			$item = '<' . $item . '>';
+		} else {
+			$item = '';
+		}
+	}
+
+	/**
+	 * Convert an ACL array to a storable string
+	 *
+	 * Normally ACL permissions will be an array.
+	 * We'll also allow a comma-separated string.
+	 *
+	 * @param string|array $permissions
+	 *
+	 * @return string
+	 */
+	function toString($permissions) {
+		$return = '';
+		if (is_array($permissions)) {
+			$item = $permissions;
+		} else {
+			$item = explode(',', $permissions);
+		}
+
+		if (is_array($item)) {
+			array_walk($item, [$this, 'sanitize']);
+			$return = implode('', $item);
+		}
+		return $return;
+	}
+}
diff --git a/src/Util/DateTimeFormat.php b/src/Util/DateTimeFormat.php
index 0b47a16f1..e29420e9e 100644
--- a/src/Util/DateTimeFormat.php
+++ b/src/Util/DateTimeFormat.php
@@ -148,4 +148,37 @@ class DateTimeFormat
 
 		return $d->format($format);
 	}
+
+	/**
+	 * Checks, if the given string is a date with the pattern YYYY-MM
+	 *
+	 * @param string $dateString The given date
+	 *
+	 * @return boolean True, if the date is a valid pattern
+	 */
+	public function isYearMonth(string $dateString)
+	{
+		// Check format (2019-01, 2019-1, 2019-10)
+		if (!preg_match('/^([12]\d{3}-(1[0-2]|0[1-9]|\d))$/', $dateString)) {
+			return false;
+		}
+
+		$date = DateTime::createFromFormat('Y-m', $dateString);
+
+		if (!$date) {
+			return false;
+		}
+
+		try {
+			$now = new DateTime();
+		} catch (\Throwable $t) {
+			return false;
+		}
+
+		if ($date > $now) {
+			return false;
+		}
+
+		return true;
+	}
 }
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 4bf97aca5..ebc70ffb5 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -24,6 +24,7 @@ use Friendica\Protocol\ActivityPub;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\OStatus;
 use Friendica\Protocol\Salmon;
+use Friendica\Util\ACLFormatter;
 
 require_once 'include/items.php';
 
@@ -272,10 +273,13 @@ class Notifier
 					$public_message = false; // private recipients, not public
 				}
 
-				$allow_people = expand_acl($parent['allow_cid']);
-				$allow_groups = Group::expand($uid, expand_acl($parent['allow_gid']),true);
-				$deny_people  = expand_acl($parent['deny_cid']);
-				$deny_groups  = Group::expand($uid, expand_acl($parent['deny_gid']));
+				/** @var ACLFormatter $aclFormatter */
+				$aclFormatter = BaseObject::getClass(ACLFormatter::class);
+
+				$allow_people = $aclFormatter->expand($parent['allow_cid']);
+				$allow_groups = Group::expand($uid, $aclFormatter->expand($parent['allow_gid']),true);
+				$deny_people  = $aclFormatter->expand($parent['deny_cid']);
+				$deny_groups  = Group::expand($uid, $aclFormatter->expand($parent['deny_gid']));
 
 				// if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 				// a delivery fork. private groups (forum_mode == 2) do not uplink
diff --git a/tests/src/Content/ItemTest.php b/tests/src/Content/ItemTest.php
new file mode 100644
index 000000000..5cdfa978b
--- /dev/null
+++ b/tests/src/Content/ItemTest.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Test\src\Content;
+
+use Friendica\Test\MockedTest;
+
+class ItemTest extends MockedTest
+{
+	public function testDetermineCategoriesTerms()
+	{
+		$this->markTestIncomplete('Test data needed.');
+	}
+}
diff --git a/tests/src/Content/Text/BBCode/VideoTest.php b/tests/src/Content/Text/BBCode/VideoTest.php
new file mode 100644
index 000000000..4a176871a
--- /dev/null
+++ b/tests/src/Content/Text/BBCode/VideoTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Friendica\Test\Content\Text\BBCode;
+
+use Friendica\Content\Text\BBCode\Video;
+use Friendica\Test\MockedTest;
+
+class VideoTest extends MockedTest
+{
+	public function dataVideo()
+	{
+		return [
+			'youtube' => [
+				'input' => '[video]https://youtube.link/4523[/video]',
+				'assert' => '[youtube]https://youtube.link/4523[/youtube]',
+			],
+			'youtu.be' => [
+				'input' => '[video]https://youtu.be.link/4523[/video]',
+				'assert' => '[youtube]https://youtu.be.link/4523[/youtube]',
+			],
+			'vimeo' => [
+				'input' => '[video]https://vimeo.link/2343[/video]',
+				'assert' => '[vimeo]https://vimeo.link/2343[/vimeo]',
+			],
+			'mixed' => [
+				'input' => '[video]https://vimeo.link/2343[/video] With other [b]string[/b] [video]https://youtu.be/blaa[/video]',
+				'assert' => '[vimeo]https://vimeo.link/2343[/vimeo] With other [b]string[/b] [youtube]https://youtu.be/blaa[/youtube]',
+			]
+		];
+	}
+
+	/**
+	 * Test if the BBCode is successfully transformed for video links
+	 *
+	 * @dataProvider dataVideo
+	 */
+	public function testTransform(string $input, string $assert)
+	{
+		$bbCodeVideo = new Video();
+
+		$this->assertEquals($assert, $bbCodeVideo->transform($input));
+	}
+}
diff --git a/tests/src/Core/InstallerTest.php b/tests/src/Core/InstallerTest.php
index a898dd295..735a52cd0 100644
--- a/tests/src/Core/InstallerTest.php
+++ b/tests/src/Core/InstallerTest.php
@@ -339,9 +339,6 @@ class InstallerTest extends MockedTest
 		// Mocking that we can use CURL
 		$this->setFunctions(['curl_init' => true]);
 
-		// needed because of "normalise_link"
-		require_once __DIR__ . '/../../../include/text.php';
-
 		$install = new Installer();
 
 		$this->assertTrue($install->checkHtAccess('https://test'));
diff --git a/tests/src/Protocol/ActivityTest.php b/tests/src/Protocol/ActivityTest.php
new file mode 100644
index 000000000..b6fcbf395
--- /dev/null
+++ b/tests/src/Protocol/ActivityTest.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Friendica\Test\Protocol;
+
+use Friendica\Protocol\Activity;
+use Friendica\Test\MockedTest;
+
+class ActivityTest extends MockedTest
+{
+	public function dataMatch()
+	{
+		return [
+			'empty' => [
+				'haystack' => '',
+				'needle' => '',
+				'assert' => true,
+			],
+			'simple' => [
+				'haystack' => ACTIVITY_OBJ_TAGTERM,
+				'needle' => ACTIVITY_OBJ_TAGTERM,
+				'assert' => true,
+			],
+			'withNamespace' => [
+				'haystack' => 'tagterm',
+				'needle' => NAMESPACE_ACTIVITY_SCHEMA . ACTIVITY_OBJ_TAGTERM,
+				'assert' => true,
+			],
+			'invalidSimple' => [
+				'haystack' => 'tagterm',
+				'needle' => '',
+				'assert' => false,
+			],
+			'invalidWithOutNamespace' => [
+				'haystack' => 'tagterm',
+				'needle' => ACTIVITY_OBJ_TAGTERM,
+				'assert' => false,
+			],
+			'withSubPath' => [
+				'haystack' => 'tagterm',
+				'needle' =>  NAMESPACE_ACTIVITY_SCHEMA . '/bla/' . ACTIVITY_OBJ_TAGTERM,
+				'assert' => true,
+			],
+		];
+	}
+
+	/**
+	 * Test the different, possible matchings
+	 *
+	 * @dataProvider dataMatch
+	 */
+	public function testMatch(string $haystack, string $needle, bool $assert)
+	{
+		$activity = new Activity();
+
+		$this->assertEquals($assert, $activity->match($haystack, $needle));
+	}
+}
diff --git a/tests/include/TextTest.php b/tests/src/Util/ACLFormaterTest.php
similarity index 53%
rename from tests/include/TextTest.php
rename to tests/src/Util/ACLFormaterTest.php
index 5676da8f6..76a566baa 100644
--- a/tests/include/TextTest.php
+++ b/tests/src/Util/ACLFormaterTest.php
@@ -1,63 +1,25 @@
 <?php
-/**
- * TextTest class.
- */
 
-namespace Friendica\Test;
+namespace Friendica\Test\src\Util;
 
 use Friendica\Model\Group;
+use Friendica\Util\ACLFormatter;
 use PHPUnit\Framework\TestCase;
 
 /**
- * Tests for text functions.
+ * @brief ACLFormater utility testing class
  */
-class TextTest extends TestCase
+class ACLFormaterTest extends TestCase
 {
-	/**
-	 * test attribute contains
-	 */
-	public function testAttributeContains1()
-	{
-		$testAttr="class1 notclass2 class3";
-		$this->assertTrue(attribute_contains($testAttr, "class3"));
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test attribute contains
-	 */
-	public function testAttributeContains2()
-	{
-		$testAttr="class1 not-class2 class3";
-		$this->assertTrue(attribute_contains($testAttr, "class3"));
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test with empty input
-	 */
-	public function testAttributeContainsEmpty()
-	{
-		$testAttr="";
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test input with special chars
-	 */
-	public function testAttributeContainsSpecialChars()
-	{
-		$testAttr="--... %\$ä() /(=?}";
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
 	/**
 	 * test expand_acl, perfect input
 	 */
 	public function testExpandAclNormal()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text='<1><2><3><' . Group::FOLLOWERS . '><' . Group::MUTUALS . '>';
-		$this->assertEquals(array('1', '2', '3', Group::FOLLOWERS, Group::MUTUALS), expand_acl($text));
+		$this->assertEquals(array('1', '2', '3', Group::FOLLOWERS, Group::MUTUALS), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -65,8 +27,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclBigNumber()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text='<1><' . PHP_INT_MAX . '><15>';
-		$this->assertEquals(array('1', (string)PHP_INT_MAX, '15'), expand_acl($text));
+		$this->assertEquals(array('1', (string)PHP_INT_MAX, '15'), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -76,8 +40,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclString()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<1><279012><tt>";
-		$this->assertEquals(array('1', '279012'), expand_acl($text));
+		$this->assertEquals(array('1', '279012'), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -87,8 +53,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclSpace()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<1><279 012><32>";
-		$this->assertEquals(array('1', '32'), expand_acl($text));
+		$this->assertEquals(array('1', '32'), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -96,8 +64,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclEmpty()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="";
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -107,8 +77,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclNoBrackets()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="According to documentation, that's invalid. "; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -118,8 +90,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclJustOneBracket1()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<Another invalid string"; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -129,8 +103,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclJustOneBracket2()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="Another invalid> string"; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -140,8 +116,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclCloseOnly()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="Another> invalid> string>"; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -151,8 +129,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclOpenOnly()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<Another< invalid string<"; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -162,8 +142,10 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclNoMatching1()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<Another<> invalid <string>"; //should be invalid
-		$this->assertEquals(array(), expand_acl($text));
+		$this->assertEquals(array(), $aclFormatter->expand($text));
 	}
 
 	/**
@@ -174,18 +156,45 @@ class TextTest extends TestCase
 	 */
 	public function testExpandAclEmptyMatch()
 	{
+		$aclFormatter = new ACLFormatter();
+
 		$text="<1><><3>";
-		$this->assertEquals(array('1', '3'), expand_acl($text));
+		$this->assertEquals(array('1', '3'), $aclFormatter->expand($text));
+	}
+
+	public function dataAclToString()
+	{
+		return [
+			'empty'   => [
+				'input'  => '',
+				'assert' => '',
+			],
+			'string'  => [
+				'input'  => '1,2,3,4',
+				'assert' => '<1><2><3><4>',
+			],
+			'array'   => [
+				'input'  => [1, 2, 3, 4],
+				'assert' => '<1><2><3><4>',
+			],
+			'invalid' => [
+				'input'  => [1, 'a', 3, 4],
+				'assert' => '<1><3><4>',
+			],
+			'invalidString' => [
+				'input'  => 'a,bsd23,4',
+				'assert' => '<4>',
+			],
+		];
 	}
 
 	/**
-	 * test hex2bin and reverse
+	 * @dataProvider dataAclToString
 	 */
-	public function testHex2Bin()
+	public function testAclToString($input, string $assert)
 	{
-		$this->assertEquals(-3, hex2bin(bin2hex(-3)));
-		$this->assertEquals(0, hex2bin(bin2hex(0)));
-		$this->assertEquals(12, hex2bin(bin2hex(12)));
-		$this->assertEquals(PHP_INT_MAX, hex2bin(bin2hex(PHP_INT_MAX)));
+		$aclFormatter = new ACLFormatter();
+
+		$this->assertEquals($assert, $aclFormatter->toString($input));
 	}
 }
diff --git a/tests/src/Util/DateTimeFormatTest.php b/tests/src/Util/DateTimeFormatTest.php
new file mode 100644
index 000000000..bdc902eab
--- /dev/null
+++ b/tests/src/Util/DateTimeFormatTest.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Friendica\Test\src\Util;
+
+use Friendica\Test\MockedTest;
+use Friendica\Util\DateTimeFormat;
+
+class DateTimeFormatTest extends MockedTest
+{
+	public function dataYearMonth()
+	{
+		return [
+			'validNormal' => [
+				'input' => '1990-10',
+				'assert' => true,
+			],
+			'validOneCharMonth' => [
+				'input' => '1990-1',
+				'assert' => true,
+			],
+			'validTwoCharMonth' => [
+				'input' => '1990-01',
+				'assert' => true,
+			],
+			'invalidFormat' => [
+				'input' => '199-11',
+				'assert' => false,
+			],
+			'invalidFormat2' => [
+				'input' => '1990-15',
+				'assert' => false,
+			],
+			'invalidFormat3' => [
+				'input' => '99-101',
+				'assert' => false,
+			],
+			'invalidFormat4' => [
+				'input' => '11-1990',
+				'assert' => false,
+			],
+			'invalidFuture' => [
+				'input' => '3030-12',
+				'assert' => false,
+			],
+			'invalidYear' => [
+				'input' => '-100-10',
+				'assert' => false,
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider dataYearMonth
+	 */
+	public function testIsYearMonth(string $input, bool $assert)
+	{
+		$dtFormat = new DateTimeFormat();
+
+		$this->assertEquals($assert, $dtFormat->isYearMonth($input));
+	}
+}