diff --git a/include/api.php b/include/api.php
index 2495f5d19..68723a0f4 100644
--- a/include/api.php
+++ b/include/api.php
@@ -237,9 +237,11 @@ function api_login(App $a)
 	if ($addon_auth['authenticated'] && !empty($addon_auth['user_record'])) {
 		$record = $addon_auth['user_record'];
 	} else {
-		$user_id = User::authenticate(trim($user), trim($password), true);
-		if ($user_id !== false) {
+		try {
+			$user_id = User::getIdFromPasswordAuthentication(trim($user), trim($password), true);
 			$record = DBA::selectFirst('user', [], ['uid' => $user_id]);
+		} catch (Exception $ex) {
+			$record = [];
 		}
 	}
 
@@ -5137,7 +5139,13 @@ function api_friendica_group_delete($type)
 	}
 
 	// delete group
-	$ret = Group::removeByName($uid, $name);
+	$gid = Group::getIdByName($uid, $name);
+	if (empty($gid)) {
+		throw new BadRequestException('other API error');
+	}
+
+	$ret = Group::remove($gid);
+
 	if ($ret) {
 		// return success
 		$success = ['success' => $ret, 'gid' => $gid, 'name' => $name, 'status' => 'deleted', 'wrong users' => []];
@@ -5372,7 +5380,8 @@ function api_friendica_group_update($type)
 			$found = ($user['cid'] == $cid ? true : false);
 		}
 		if (!isset($found) || !$found) {
-			Group::removeMemberByName($uid, $name, $cid);
+			$gid = Group::getIdByName($uid, $name);
+			Group::removeMember($gid, $cid);
 		}
 	}
 
diff --git a/mod/item.php b/mod/item.php
index 1309dce47..da3eb16c3 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -352,7 +352,8 @@ function item_post(App $a) {
 		$filedas = FileTag::fileToArray($categories);
 	}
 
-	$categories = FileTag::listToFile(trim($_REQUEST['category'] ?? ''), 'category');
+	$list_array = explode(',', trim($_REQUEST['category'] ?? ''));
+	$categories = FileTag::arrayToFile($list_array, 'category');
 
 	if (!empty($filedas) && is_array($filedas)) {
 		// append the fileas stuff to the new categories list
diff --git a/mod/settings.php b/mod/settings.php
index b1b8abd94..080bcdeb9 100644
--- a/mod/settings.php
+++ b/mod/settings.php
@@ -308,7 +308,9 @@ function settings_post(App $a)
 
 	if ($email != $user['email']) {
 		//  check for the correct password
-		if (!User::authenticate(intval(local_user()), $_POST['mpassword'])) {
+		try {
+			User::getIdFromPasswordAuthentication(local_user(), $_POST['mpassword']);
+		} catch (Exception $ex) {
 			$err .= DI::l10n()->t('Wrong Password.');
 			$email = $user['email'];
 		}
diff --git a/src/Content/Text/HTML.php b/src/Content/Text/HTML.php
index e1caca48a..f4462199e 100644
--- a/src/Content/Text/HTML.php
+++ b/src/Content/Text/HTML.php
@@ -784,16 +784,6 @@ class HTML
 		return $text;
 	}
 
-	/**
-	 * return div element with class 'clear'
-	 * @return string
-	 * @deprecated
-	 */
-	public static function clearDiv()
-	{
-		return '<div class="clear"></div>';
-	}
-
 	/**
 	 * Loader for infinite scrolling
 	 *
diff --git a/src/Core/Addon.php b/src/Core/Addon.php
index 7b3c86a65..357c02bcb 100644
--- a/src/Core/Addon.php
+++ b/src/Core/Addon.php
@@ -320,51 +320,4 @@ class Addon
 
 		return $visible_addons;
 	}
-
-	/**
-	 * Shim of Hook::register left for backward compatibility purpose.
-	 *
-	 * @see        Hook::register
-	 * @deprecated since version 2018.12
-	 * @param string $hook     the name of the hook
-	 * @param string $file     the name of the file that hooks into
-	 * @param string $function the name of the function that the hook will call
-	 * @param int    $priority A priority (defaults to 0)
-	 * @return mixed|bool
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
-	 */
-	public static function registerHook($hook, $file, $function, $priority = 0)
-	{
-		return Hook::register($hook, $file, $function, $priority);
-	}
-
-	/**
-	 * Shim of Hook::unregister left for backward compatibility purpose.
-	 *
-	 * @see        Hook::unregister
-	 * @deprecated since version 2018.12
-	 * @param string $hook     the name of the hook
-	 * @param string $file     the name of the file that hooks into
-	 * @param string $function the name of the function that the hook called
-	 * @return boolean
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
-	 */
-	public static function unregisterHook($hook, $file, $function)
-	{
-		return Hook::unregister($hook, $file, $function);
-	}
-
-	/**
-	 * Shim of Hook::callAll left for backward-compatibility purpose.
-	 *
-	 * @see        Hook::callAll
-	 * @deprecated since version 2018.12
-	 * @param string        $name of the hook to call
-	 * @param string|array &$data to transmit to the callback handler
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
-	 */
-	public static function callHooks($name, &$data = null)
-	{
-		Hook::callAll($name, $data);
-	}
 }
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 03cd09fc5..8d7799f63 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -57,36 +57,6 @@ class Contact
 	const DEFAULT_AVATAR_THUMB = '/images/person-80.jpg';
 	const DEFAULT_AVATAR_MICRO = '/images/person-48.jpg';
 
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_NORMAL
-	 */
-	const PAGE_NORMAL    = User::PAGE_FLAGS_NORMAL;
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_SOAPBOX
-	 */
-	const PAGE_SOAPBOX   = User::PAGE_FLAGS_SOAPBOX;
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_COMMUNITY
-	 */
-	const PAGE_COMMUNITY = User::PAGE_FLAGS_COMMUNITY;
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_FREELOVE
-	 */
-	const PAGE_FREELOVE  = User::PAGE_FLAGS_FREELOVE;
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_BLOG
-	 */
-	const PAGE_BLOG      = User::PAGE_FLAGS_BLOG;
-	/**
-	 * @deprecated since version 2019.03
-	 * @see User::PAGE_FLAGS_PRVGROUP
-	 */
-	const PAGE_PRVGROUP  = User::PAGE_FLAGS_PRVGROUP;
 	/**
 	 * @}
 	 */
diff --git a/src/Model/FileTag.php b/src/Model/FileTag.php
index 324a78fa6..d459237e7 100644
--- a/src/Model/FileTag.php
+++ b/src/Model/FileTag.php
@@ -114,21 +114,4 @@ class FileTag
 
 		return $return;
 	}
-
-	/**
-	 * Get file tags from list
-	 *
-	 * ex. given music,video return <music><video> or [music][video]
-	 * @param string $list A comma delimited list of tags.
-	 * @param string $type Optional file type.
-	 *
-	 * @return string       A list of file tags.
-	 * @deprecated since 2019.06 use arrayToFile() instead
-	 */
-	public static function listToFile(string $list, string $type = 'file')
-	{
-		$list_array = explode(',', $list);
-
-		return self::arrayToFile($list_array, $type);
-	}
 }
diff --git a/src/Model/Group.php b/src/Model/Group.php
index 889f8269d..8e7f807cf 100644
--- a/src/Model/Group.php
+++ b/src/Model/Group.php
@@ -251,28 +251,6 @@ class Group
 		return $return;
 	}
 
-	/**
-	 * Mark a group as deleted based on its name
-	 *
-	 * @param int    $uid
-	 * @param string $name
-	 * @return bool
-	 * @throws \Exception
-	 * @deprecated Use Group::remove instead
-	 *
-	 */
-	public static function removeByName($uid, $name)
-	{
-		$return = false;
-		if (!empty($uid) && !empty($name)) {
-			$gid = self::getIdByName($uid, $name);
-
-			$return = self::remove($gid);
-		}
-
-		return $return;
-	}
-
 	/**
 	 * Adds a contact to a group
 	 *
@@ -317,26 +295,6 @@ class Group
 		return $return;
 	}
 
-	/**
-	 * Removes a contact from a group based on its name
-	 *
-	 * @param int    $uid
-	 * @param string $name
-	 * @param int    $cid
-	 * @return boolean
-	 * @throws \Exception
-	 * @deprecated Use Group::removeMember instead
-	 *
-	 */
-	public static function removeMemberByName($uid, $name, $cid)
-	{
-		$gid = self::getIdByName($uid, $name);
-
-		$return = self::removeMember($gid, $cid);
-
-		return $return;
-	}
-
 	/**
 	 * Returns the combined list of contact ids from a group id list
 	 *
diff --git a/src/Model/Notification/Type.php b/src/Model/Notification/Type.php
index 4d669f4f9..88172a23f 100644
--- a/src/Model/Notification/Type.php
+++ b/src/Model/Notification/Type.php
@@ -38,16 +38,8 @@ class Type
 	const MAIL = 16;
 	/** @var int Notification about a friend suggestion */
 	const SUGGEST = 32;
-	/** @var int Unknown Notification
-	 * @deprecated
-	 */
-	const PROFILE = 64;
 	/** @var int Notification about being tagged in a post */
 	const TAG_SELF = 128;
-	/** @var int Notification about being tagged
-	 * @deprecated
-	 */
-	const TAG_SHARE = 256;
 	/** @var int Notification about getting poked/prodded/etc. */
 	const POKE = 512;
 	/** @var int Notification about either a contact had posted something directly or the contact is a mentioned forum */
diff --git a/src/Model/User.php b/src/Model/User.php
index 57d5560a4..c43209b22 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -499,26 +499,6 @@ class User
 		return $default_group;
 	}
 
-
-	/**
-	 * Authenticate a user with a clear text password
-	 *
-	 * @param mixed  $user_info
-	 * @param string $password
-	 * @param bool   $third_party
-	 * @return int|boolean
-	 * @deprecated since version 3.6
-	 * @see        User::getIdFromPasswordAuthentication()
-	 */
-	public static function authenticate($user_info, $password, $third_party = false)
-	{
-		try {
-			return self::getIdFromPasswordAuthentication($user_info, $password, $third_party);
-		} catch (Exception $ex) {
-			return false;
-		}
-	}
-
 	/**
 	 * Authenticate a user with a clear text password
 	 *
diff --git a/src/Object/Image.php b/src/Object/Image.php
index 4551db248..608f64e97 100644
--- a/src/Object/Image.php
+++ b/src/Object/Image.php
@@ -685,49 +685,4 @@ class Image
 
 		return $string;
 	}
-
-	/**
-	 * supported mimetypes and corresponding file extensions
-	 *
-	 * @return array
-	 * @deprecated in version 2019.12 please use Util\Images::supportedTypes() instead.
-	 */
-	public static function supportedTypes()
-	{
-		return Images::supportedTypes();
-	}
-
-	/**
-	 * Maps Mime types to Imagick formats
-	 *
-	 * @return array With with image formats (mime type as key)
-	 * @deprecated in version 2019.12 please use Util\Images::getFormatsMap() instead.
-	 */
-	public static function getFormatsMap()
-	{
-		return Images::getFormatsMap();
-	}
-
-	/**
-	 * @param string $url url
-	 * @return array
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
-	 * @deprecated in version 2019.12 please use Util\Images::getInfoFromURLCached() instead.
-	 */
-	public static function getInfoFromURL($url)
-	{
-		return Images::getInfoFromURLCached($url);
-	}
-
-	/**
-	 * @param integer $width  width
-	 * @param integer $height height
-	 * @param integer $max    max
-	 * @return array
-	 * @deprecated in version 2019.12 please use Util\Images::getScalingDimensions() instead.
-	 */
-	public static function getScalingDimensions($width, $height, $max)
-	{
-		return Images::getScalingDimensions($width, $height, $max);
-	}
 }
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index ca8a76b6b..9988a4009 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -865,8 +865,8 @@ class OStatus
 	private static function fetchSelf($self, array &$item)
 	{
 		$condition = ['item-uri' => $self, 'protocol' => [Conversation::PARCEL_DFRN,
-			Conversation::PARCEL_DIASPORA_DFRN, Conversation::PARCEL_LEGACY_DFRN,
-			Conversation::PARCEL_LOCAL_DFRN, Conversation::PARCEL_DIRECT, Conversation::PARCEL_SALMON]];
+			Conversation::PARCEL_DIASPORA_DFRN, Conversation::PARCEL_LOCAL_DFRN,
+			Conversation::PARCEL_DIRECT, Conversation::PARCEL_SALMON]];
 		if (DBA::exists('conversation', $condition)) {
 			Logger::info('Conversation '.$item['uri'].' is already stored.');
 			return;
@@ -905,8 +905,8 @@ class OStatus
 	private static function fetchRelated($related, $related_uri, $importer)
 	{
 		$condition = ['item-uri' => $related_uri, 'protocol' => [Conversation::PARCEL_DFRN,
-			Conversation::PARCEL_DIASPORA_DFRN, Conversation::PARCEL_LEGACY_DFRN,
-			Conversation::PARCEL_LOCAL_DFRN, Conversation::PARCEL_DIRECT, Conversation::PARCEL_SALMON]];
+			Conversation::PARCEL_DIASPORA_DFRN, Conversation::PARCEL_LOCAL_DFRN,
+			Conversation::PARCEL_DIRECT, Conversation::PARCEL_SALMON]];
 		$conversation = DBA::selectFirst('conversation', ['source', 'protocol'], $condition);
 		if (DBA::isResult($conversation)) {
 			$stored = true;