diff --git a/mod/item.php b/mod/item.php
index 56f27a9543..7d565bc35b 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -40,6 +40,7 @@ use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\APContact;
 use Friendica\Model\Attach;
 use Friendica\Model\Contact;
 use Friendica\Model\Conversation;
@@ -435,21 +436,27 @@ function item_post(App $a) {
 	$original_contact_id = $contact_id;
 
 	if (!$toplevel_item_id && !empty($forum_contact) && ($private_forum || $only_to_forum)) {
-		// we tagged a forum in a top level post. Now we change the post
-		$private = $private_forum;
+		// we tagged a forum in a top level post. Now we change the post		
+		$private = $private_forum ? Item::PRIVATE : Item::UNLISTED;
 
-		$str_group_allow = '';
-		$str_contact_deny = '';
-		$str_group_deny = '';
-		if ($private_forum) {
-			$str_contact_allow = '<' . $private_id . '>';
-		} else {
-			$str_contact_allow = '';
+		if ($only_to_forum) {
+			$postopts = '';
+		}
+
+		if ($private_forum || !APContact::getByURL($forum_contact['url'])) {
+			$str_group_allow = '';
+			$str_contact_deny = '';
+			$str_group_deny = '';
+			if ($private_forum) {
+				$str_contact_allow = '<' . $private_id . '>';
+			} else {
+				$str_contact_allow = '';
+			}
+			$contact_id = $private_id;
+			$contact_record = $forum_contact;
+			$_REQUEST['origin'] = false;
+			$wall = 0;
 		}
-		$contact_id = $private_id;
-		$contact_record = $forum_contact;
-		$_REQUEST['origin'] = false;
-		$wall = 0;
 	}
 
 	/*
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 2b57557ca8..f85bce5e8f 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1061,7 +1061,7 @@ class Item
 		}
 
 		// Create Diaspora signature
-		if ($item['origin'] && empty($item['diaspora_signed_text'])) {
+		if ($item['origin'] && empty($item['diaspora_signed_text']) && ($item['gravity'] != GRAVITY_PARENT)) {
 			$signed = Diaspora::createCommentSignature($uid, $item);
 			if (!empty($signed)) {
 				$item['diaspora_signed_text'] = json_encode($signed);
@@ -1227,13 +1227,10 @@ class Item
 				Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
 				return;
 			}
-			self::update(['post-reason' => self::PR_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
-			Logger::info('Set announcement post-reason', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
-			return;
 		}
 
-		self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
-		Logger::info('Change owner of the parent', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid'], 'owner-id' => $item['author-id'], 'contact-id' => $cid]);
+		self::update(['post-reason' => self::PR_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
+		Logger::info('Set announcement post-reason', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 	}
 
 	/**
@@ -1922,7 +1919,7 @@ class Item
 
 		// also reset all the privacy bits to the forum default permissions
 
-		$private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
+		$private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::UNLISTED;
 
 		$psid = PermissionSet::getIdFromACL(
 			$user['uid'],
diff --git a/src/Module/Conversation/Network.php b/src/Module/Conversation/Network.php
index c093cc9ca6..046c6de8c3 100644
--- a/src/Module/Conversation/Network.php
+++ b/src/Module/Conversation/Network.php
@@ -20,8 +20,10 @@ use Friendica\Model\Item;
 use Friendica\Model\Post;
 use Friendica\Model\Profile;
 use Friendica\Model\User;
+use Friendica\Model\Verb;
 use Friendica\Module\Contact as ModuleContact;
 use Friendica\Module\Security\Login;
+use Friendica\Protocol\Activity;
 use Friendica\Util\DateTimeFormat;
 
 class Network extends BaseModule
@@ -388,7 +390,9 @@ class Network extends BaseModule
 		if (self::$groupId) {
 			$conditionStrings = DBA::mergeConditions($conditionStrings, ["`contact-id` IN (SELECT `contact-id` FROM `group_member` WHERE `gid` = ?)", self::$groupId]);
 		} elseif (self::$forumContactId) {
-			$conditionFields['contact-id'] = self::$forumContactId;
+			$conditionStrings = DBA::mergeConditions($conditionStrings, 
+				["((`contact-id` = ?) OR EXISTS(SELECT `uri-id` FROM `post-user-view` WHERE `post-user-view`.`parent-uri-id` = `network-thread-view`.`uri-id` AND (`contact-id` = ? AND `gravity` = ? AND `vid` = ? AND `uid` = ?)))",
+				self::$forumContactId, self::$forumContactId, GRAVITY_ACTIVITY, Verb::getID(Activity::ANNOUNCE), local_user()]);
 		}
 
 		// Currently only the order modes "received" and "commented" are in use
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index bfb1287c82..76bc295d1c 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -533,6 +533,8 @@ class Transmitter
 			$actor_profile = APContact::getByURL($item['author-link']);
 		}
 
+		$exclusive = false;
+
 		$terms = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 
 		if ($item['private'] != Item::PRIVATE) {
@@ -557,6 +559,9 @@ class Transmitter
 			foreach ($terms as $term) {
 				$profile = APContact::getByURL($term['url'], false);
 				if (!empty($profile)) {
+					if ($term['type'] == Tag::EXCLUSIVE_MENTION) {
+						$exclusive = true;
+					}
 					$data['to'][] = $profile['url'];
 				}
 			}
@@ -612,7 +617,7 @@ class Transmitter
 									$data['cc'][] = $actor_profile['followers'];
 								}
 							}
-						} else {
+						} elseif (!$exclusive) {
 							// Public thread parent post always are directed to the followers
 							if (($item['private'] != Item::PRIVATE) && !$forum_mode) {
 								$data['cc'][] = $actor_profile['followers'];
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index de2774594d..4af1bc9148 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -283,6 +283,16 @@ class Notifier
 				}
 
 				Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
+			} elseif ($targets = Tag::getByURIId($target_item['uri-id'], [Tag::EXCLUSIVE_MENTION])) {
+				$followup = true;
+
+				foreach ($targets as $target) {
+					$cid = Contact::getIdForURL($target['url'], $uid, false);
+					if ($cid) {
+						$recipients_followup[] = $cid;
+						Logger::info('Exclusively delivering', ['guid' => $target_item['guid'], 'uri-id' => $target_item['uri-id'], 'url' => $target['url']]);
+					}
+				}
 			} else {
 				$followup = false;