diff --git a/mod/item.php b/mod/item.php
index 70c5c9a8b6..e85c08e023 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -222,7 +222,7 @@ function item_insert(int $uid, array $request, bool $preview, string $return_pat
 	DI::contentItem()->postProcessPost($post, $recipients);
 
 	if (($post['private'] == Item::PRIVATE) && ($post['thr-parent-id'] != $post['uri-id'])) {
-		DI::contentItem()->copyPermissions($post['thr-parent-id'], $post['uri-id']);
+		DI::contentItem()->copyPermissions($post['thr-parent-id'], $post['uri-id'], $post['parent-uri-id']);
 	}
 
 	Logger::debug('post_complete');
diff --git a/src/Content/Item.php b/src/Content/Item.php
index ab5ff1698f..f74a958962 100644
--- a/src/Content/Item.php
+++ b/src/Content/Item.php
@@ -1070,17 +1070,32 @@ class Item
 		}
 	}
 
-	public function copyPermissions(int $fromUriId, int $toUriId)
+	public function copyPermissions(int $fromUriId, int $toUriId, int $parentUriId)
 	{
-		$from        = Post::selectFirstPost(['author-id'], ['uri-id' => $fromUriId]);
-		$from_author = DBA::selectFirst('account-view', ['ap-followers'], ['id' => $from['author-id']]);
-		$to          = Post::selectFirstPost(['author-id'], ['uri-id' => $toUriId]);
-		$to_author   = DBA::selectFirst('account-view', ['ap-followers'], ['id' => $to['author-id']]);
+		$from          = Post::selectFirstPost(['author-id'], ['uri-id' => $fromUriId]);
+		$from_author   = DBA::selectFirst('account-view', ['ap-followers'], ['id' => $from['author-id']]);
+		$to            = Post::selectFirstPost(['author-id'], ['uri-id' => $toUriId]);
+		$to_author     = DBA::selectFirst('account-view', ['ap-followers'], ['id' => $to['author-id']]);
+		$parent        = Post::selectFirstPost(['author-id'], ['uri-id' => $parentUriId]);
+		$parent_author = DBA::selectFirst('account-view', ['ap-followers'], ['id' => $parent['author-id']]);
+		
+		$followers = '';
+		foreach (array_column(Tag::getByURIId($parentUriId, [Tag::TO, Tag::CC, Tag::BCC]), 'url') as $url) {
+			if ($url == $parent_author['ap-followers']) {
+				$followers = $url;
+				break;
+			}
+		}
 
 		$existing = array_column(Tag::getByURIId($toUriId, [Tag::TO, Tag::CC, Tag::BCC]), 'url');
 
 		foreach (Tag::getByURIId($fromUriId, [Tag::TO, Tag::CC, Tag::BCC]) as $receiver) {
 			if ($receiver['url'] == $from_author['ap-followers']) {
+				if (!empty($followers)) {
+					$receiver['url']  = $followers;
+					$receiver['name'] = trim(parse_url($receiver['url'], PHP_URL_PATH), '/');
+					Tag::store($toUriId, $receiver['type'], $receiver['name'], $receiver['url']);
+				}
 				$receiver['url']  = $to_author['ap-followers'];
 				$receiver['name'] = trim(parse_url($receiver['url'], PHP_URL_PATH), '/');
 			}
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 27fcfcdd9b..0e741ce816 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1366,7 +1366,7 @@ class Item
 		if ($notify) {
 			DI::contentItem()->postProcessPost($posted_item);
 			if ($copy_permissions && ($posted_item['thr-parent-id'] != $posted_item['uri-id']) && ($posted_item['private'] == self::PRIVATE)) {
-				DI::contentItem()->copyPermissions($posted_item['thr-parent-id'], $posted_item['uri-id']);
+				DI::contentItem()->copyPermissions($posted_item['thr-parent-id'], $posted_item['uri-id'], $posted_item['parent-uri-id']);
 			}
 		} else {
 			Hook::callAll('post_remote_end', $posted_item);
@@ -3758,7 +3758,7 @@ class Item
 		DI::profiler()->startRecording('rendering');
 		$trailing = '';
 		foreach ($PostMedias as $PostMedia) {
-			if (strpos($item['body'], $PostMedia->url)) {
+			if (strpos($item['body'], (string)$PostMedia->url)) {
 				continue;
 			}
 
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index e6371a5975..de3acfea91 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -308,12 +308,13 @@ class Receiver
 	 * @param boolean $push           Message had been pushed to our system
 	 * @param boolean $trust_source   Do we trust the source?
 	 * @param string  $original_actor Actor of the original activity. Used for receiver detection. (Optional)
+	 * @param string  $http_signer    Actor who has signed the HTTP request
 	 *
 	 * @return array with object data
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	public static function prepareObjectData(array $activity, int $uid, bool $push, bool &$trust_source, string $original_actor = ''): array
+	public static function prepareObjectData(array $activity, int $uid, bool $push, bool &$trust_source, string $original_actor = '', string $http_signer = ''): array
 	{
 		$id        = JsonLD::fetchElement($activity, '@id');
 		$type      = JsonLD::fetchElement($activity, '@type');
@@ -332,7 +333,7 @@ class Receiver
 		$fetched = false;
 
 		if (!empty($id) && !$trust_source) {
-			$fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor);
+			$fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor, '');
 
 			$fetched_activity = Processor::fetchCachedActivity($fetch_id, $fetch_uid);
 			if (!empty($fetched_activity)) {
@@ -368,7 +369,7 @@ class Receiver
 		$type = JsonLD::fetchElement($activity, '@type');
 
 		// Fetch all receivers from to, cc, bto and bcc
-		$receiverdata = self::getReceivers($activity, $original_actor ?: $actor, [], false, $push || $fetched);
+		$receiverdata = self::getReceivers($activity, $original_actor ?: $actor, [], false, $push || $fetched, $http_signer);
 		$receivers = $reception_types = [];
 		foreach ($receiverdata as $key => $data) {
 			$receivers[$key] = $data['uid'];
@@ -392,7 +393,7 @@ class Receiver
 
 		// We possibly need some user to fetch private content,
 		// so we fetch one out of the receivers if no uid is provided.
-		$fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor);
+		$fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor, $http_signer);
 
 		$object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
 		if (empty($object_id)) {
@@ -682,7 +683,7 @@ class Receiver
 		}
 
 		// $trust_source is called by reference and is set to true if the content was retrieved successfully
-		$object_data = self::prepareObjectData($activity, $uid, $push, $trust_source, $original_actor);
+		$object_data = self::prepareObjectData($activity, $uid, $push, $trust_source, $original_actor, $trust_source ? $http_signer : '');
 		if (empty($object_data)) {
 			Logger::info('No object data found', ['activity' => $activity]);
 			return true;
@@ -1094,15 +1095,16 @@ class Receiver
 	 *
 	 * @param array  $activity
 	 * @param string $actor
+	 * @param string $http_signer
 	 *
 	 * @return int   user id
 	 */
-	public static function getBestUserForActivity(array $activity, string $actor = ''): int
+	public static function getBestUserForActivity(array $activity, string $actor = '', string $http_signer): int
 	{
 		$uid = 0;
 		$actor = $actor ?: JsonLD::fetchElement($activity, 'as:actor', '@id') ?? '';
 
-		$receivers = self::getReceivers($activity, $actor, [], false, false);
+		$receivers = self::getReceivers($activity, $actor, [], false, false, $http_signer);
 		foreach ($receivers as $receiver) {
 			if ($receiver['type'] == self::TARGET_GLOBAL) {
 				return 0;
@@ -1157,11 +1159,12 @@ class Receiver
 	 * @param array  $tags
 	 * @param bool   $fetch_unlisted
 	 * @param bool   $push
+	 * @param string $http_signer
 	 *
 	 * @return array with receivers (user id)
 	 * @throws \Exception
 	 */
-	private static function getReceivers(array $activity, string $actor, array $tags, bool $fetch_unlisted, bool $push): array
+	private static function getReceivers(array $activity, string $actor, array $tags, bool $fetch_unlisted, bool $push, string $http_signer): array
 	{
 		$reply = $receivers = $profile = [];
 
@@ -1200,6 +1203,13 @@ class Receiver
 		// We have to prevent false follower assumptions upon thread completions
 		$follower_target = empty($activity['thread-completion']) ? self::TARGET_FOLLOWER : self::TARGET_UNKNOWN;
 
+		if (($actor != $http_signer) && ($http_signer != '') && ($follower_target == self::TARGET_FOLLOWER)) {
+			$signer_profile   = APContact::getByURL($http_signer);
+			$signer_followers = $signer_profile['followers'] ?? '';
+		} else {
+			$signer_followers = '';
+		}
+
 		foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc','as:audience'] as $element) {
 			$receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
 			if (empty($receiver_list)) {
@@ -1222,6 +1232,11 @@ class Receiver
 					continue;
 				}
 
+				if ($receiver == $signer_followers) {
+					$receivers = self::getReceiverForActor($http_signer, [], $receivers, $follower_target, $signer_profile);
+					continue;
+				}
+
 				// Fetching all directly addressed receivers
 				$condition = ['self' => true, 'nurl' => Strings::normaliseLink($receiver)];
 				$contact = DBA::selectFirst('contact', ['uid', 'contact-type'], $condition);
@@ -1949,7 +1964,7 @@ class Receiver
 
 		$object_data = self::getObjectDataFromActivity($object);
 
-		$receiverdata = self::getReceivers($object, $actor ?: $object_data['actor'] ?? '', $object_data['tags'], true, false);
+		$receiverdata = self::getReceivers($object, $actor ?: $object_data['actor'] ?? '', $object_data['tags'], true, false, '');
 		$receivers = $reception_types = [];
 		foreach ($receiverdata as $key => $data) {
 			$receivers[$key] = $data['uid'];