diff --git a/src/Model/Item.php b/src/Model/Item.php
index 7956494675..769a2898aa 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1909,6 +1909,15 @@ class Item
 			return false;
 		}
 
+		self::performActivity($item['id'], 'announce', $uid);
+
+		/**
+		 * All the following lines are only needed for private forums and compatibility to older systems without AP support.
+		 * A possible way would be that the followers list of a forum would always be readable by all followers.
+		 * So this would mean that the comment distribution could be done exactly for the intended audience.
+		 * Or possibly we could store the receivers that had been in the "announce" message above and use this.
+		 */
+
 		// now change this copy of the post to a forum head message and deliver to all the tgroup members
 		$self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
 		if (!DBA::isResult($self)) {
@@ -1942,8 +1951,6 @@ class Item
 
 		Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, (int)$item['uri-id'], (int)$item['uid']);
 
-		self::performActivity($item['id'], 'announce', $uid);
-
 		return false;
 	}
 
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 76bc295d1c..018fdc7b0f 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -618,7 +618,9 @@ class Transmitter
 								}
 							}
 						} elseif (!$exclusive) {
-							// Public thread parent post always are directed to the followers
+							// Public thread parent post always are directed to the followers.
+							// This mustn't be done by posts that are directed to forum servers via the exclusive mention.
+							// But possibly in that case we could add the "followers" collection of the forum to the message.
 							if (($item['private'] != Item::PRIVATE) && !$forum_mode) {
 								$data['cc'][] = $actor_profile['followers'];
 							}