diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 6d94b1b49..25f064fd6 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -343,6 +343,8 @@ class Processor
 			$item['body'] = $activity['source'];
 		}
 
+		$stored = false;
+
 		foreach ($activity['receiver'] as $receiver) {
 			$item['uid'] = $receiver;
 			$item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
@@ -357,13 +359,18 @@ class Processor
 
 			$item_id = Item::insert($item);
 			Logger::log('Storing for user ' . $item['uid'] . ': ' . $item_id);
+
+			if ($item['uid'] == 0) {
+				$stored = $item_id;
+			}
 		}
 
-		if (!$item['private'] && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
+		// Store send a follow request for every reshare - but only when the item had been stored
+		if ($stored && !$item['private'] && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 			$author = APContact::getByURL($item['owner-link'], false);
 			// We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 			if ($author['type'] != 'Group') {
-				Logger::log('Send follow request for ' . $item['uri'] . ' to ' . $item['author-link'], Logger::DEBUG);
+				Logger::log('Send follow request for ' . $item['uri'] . ' (' . $stored . ') to ' . $item['author-link'], Logger::DEBUG);
 				ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 			}
 		}
@@ -662,11 +669,12 @@ class Processor
 		}
 
 		foreach ($parent_terms as $term) {
-			$contact = Contact::getDetailsByURL($term['url']);
-
-			$implicit_mentions[] = $contact['url'];
-			$implicit_mentions[] = $contact['nurl'];
-			$implicit_mentions[] = $contact['alias'];
+			$contact = Contact::getDetailsByURL($term['url'], 0);
+			if (!empty($contact)) {
+				$implicit_mentions[] = $contact['url'];
+				$implicit_mentions[] = $contact['nurl'];
+				$implicit_mentions[] = $contact['alias'];
+			}
 		}
 
 		return $implicit_mentions;
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 1032627b3..ebd32786a 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -1317,6 +1317,13 @@ class Transmitter
 			$uid = $first_user['uid'];
 		}
 
+		$condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
+			'author-id' => Contact::getPublicIdByUserId($uid)];
+		if (Item::exists($condition)) {
+			Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
+			return false;
+		}
+
 		$owner = User::getOwnerDataById($uid);
 
 		$data = ['@context' => ActivityPub::CONTEXT,