diff --git a/include/items.php b/include/items.php
index 3b4a5a193..69b4a0f25 100644
--- a/include/items.php
+++ b/include/items.php
@@ -1149,6 +1149,19 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
 		}
 	}
 
+	// If there is no guid then take the same guid that was taken before for the same plink
+	if ((trim($arr['guid']) == "") AND (trim($arr['plink']) != "")) {
+		logger('item_store: checking for an existing guid for plink '.$arr['plink'], LOGGER_DEBUG);
+		$r = q("SELECT `guid` FROM `item` WHERE `plink` = '%s' AND `guid` != '' LIMIT 1",
+			dbesc(trim($arr['plink']))
+		);
+
+		if(count($r)) {
+			$arr['guid'] = $r[0]["guid"];
+			logger('item_store: found guid '.$arr['guid'].' for plink '.$arr['plink'], LOGGER_DEBUG);
+		}
+	}
+
 	// Shouldn't happen but we want to make absolutely sure it doesn't leak from a plugin.
 	// Deactivated, since the bbcode parser can handle with it - and it destroys posts with some smileys that contain "<"
 	//if((strpos($arr['body'],'<') !== false) || (strpos($arr['body'],'>') !== false))
@@ -1355,26 +1368,37 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
 		}
 	}
 
-	$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
+	$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `network` = '%s' AND `uid` = %d LIMIT 1",
 		dbesc($arr['uri']),
+		dbesc($arr['network']),
 		intval($arr['uid'])
 	);
-
 	if($r && count($r)) {
 		logger('duplicated item with the same uri found. ' . print_r($arr,true));
 		return 0;
-	} else {
-		// Check for an existing post with the same content. There seems to be a problem with OStatus.
-		$r = q("SELECT `id` FROM `item` WHERE `body` = '%s' AND `created` = '%s' AND `contact-id` = %d AND `uid` = %d LIMIT 1",
-			dbesc($arr['body']),
-			dbesc($arr['created']),
-			intval($arr['contact-id']),
-			intval($arr['uid'])
-		);
-		if($r && count($r)) {
-			logger('duplicated item with the same body found. ' . print_r($arr,true));
-			return 0;
-		}
+	}
+
+	$r = q("SELECT `id` FROM `item` WHERE `plink` = '%s' AND `network` = '%s' AND `uid` = %d LIMIT 1",
+		dbesc($arr['plink']),
+		dbesc($arr['network']),
+		intval($arr['uid'])
+	);
+	if($r && count($r)) {
+		logger('duplicated item with the same plink found. ' . print_r($arr,true));
+		return 0;
+	}
+
+	// Check for an existing post with the same content. There seems to be a problem with OStatus.
+	$r = q("SELECT `id` FROM `item` WHERE `body` = '%s' AND `network` = '%s' AND `created` = '%s' AND `contact-id` = %d AND `uid` = %d LIMIT 1",
+		dbesc($arr['body']),
+		dbesc($arr['network']),
+		dbesc($arr['created']),
+		intval($arr['contact-id']),
+		intval($arr['uid'])
+	);
+	if($r && count($r)) {
+		logger('duplicated item with the same body found. ' . print_r($arr,true));
+		return 0;
 	}
 
 	// Is this item available in the global items (with uid=0)?
diff --git a/include/ostatus_conversation.php b/include/ostatus_conversation.php
index da8dda292..f21f8248f 100644
--- a/include/ostatus_conversation.php
+++ b/include/ostatus_conversation.php
@@ -143,6 +143,8 @@ function complete_conversation($itemid, $conversation_url, $only_add_conversatio
 			$plink = $single_conv->provider->url."notice/".$single_conv->statusnet_notice_info->local_id;
 		elseif (isset($single_conv->provider->url) AND isset($single_conv->statusnet->notice_info->local_id))
 			$plink = $single_conv->provider->url."notice/".$single_conv->statusnet->notice_info->local_id;
+		elseif (isset($single_conv->provider->url) AND isset($single_conv->status_net->notice_info->local_id))
+			$plink = $single_conv->provider->url."notice/".$single_conv->status_net->notice_info->local_id;
 
 		if (@!$single_conv->id)
 			continue;
@@ -153,8 +155,9 @@ function complete_conversation($itemid, $conversation_url, $only_add_conversatio
 		if ($first_id == "") {
 			$first_id = $single_conv->id;
 
-			$new_parents = q("SELECT `id`, `uri`, `contact-id`, `type`, `verb`, `visible` FROM `item` WHERE `uid` = %d AND `uri` = '%s' LIMIT 1",
-				intval($message["uid"]), dbesc($first_id));
+			$new_parents = q("SELECT `id`, `uri`, `contact-id`, `type`, `verb`, `visible` FROM `item` WHERE `uid` = %d AND `uri` = '%s' AND `network` IN ('%s','%s') LIMIT 1",
+				intval($message["uid"]), dbesc($first_id),
+				dbesc(NETWORK_OSTATUS), dbesc(NETWORK_DFRN));
 			if ($new_parents) {
 				$parent = $new_parents[0];
 				logger('adopting new parent '.$parent["id"].' for '.$itemid);
@@ -169,17 +172,21 @@ function complete_conversation($itemid, $conversation_url, $only_add_conversatio
 		else
 			$parent_uri = $parent["uri"];
 
-		$message_exists = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `plink` = '%s' LIMIT 1",
-							intval($message["uid"]), dbesc($plink));
+		$message_exists = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `plink` = '%s' AND `network` IN ('%s','%s') LIMIT 1",
+							intval($message["uid"]), dbesc($plink),
+							dbesc(NETWORK_OSTATUS), dbesc(NETWORK_DFRN));
 
 		if (!$message_exists)
-			$message_exists = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `uri` = '%s' LIMIT 1",
-							intval($message["uid"]), dbesc($single_conv->id));
+			$message_exists = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `uri` = '%s' AND `network` IN ('%s','%s') LIMIT 1",
+							intval($message["uid"]), dbesc($single_conv->id),
+							dbesc(NETWORK_OSTATUS), dbesc(NETWORK_DFRN));
 
 		if ($message_exists) {
 			if ($parent["id"] != 0) {
 				$existing_message = $message_exists[0];
 
+				logger('updating id '.$existing_message["id"].' to parent '.$parent["id"].' uri '.$parent["uri"].' thread '.$parent_uri, LOGGER_DEBUG);
+
 				// This is partly bad, since the entry in the thread table isn't updated
 				$r = q("UPDATE `item` SET `parent` = %d, `parent-uri` = '%s', `thr-parent` = '%s' WHERE `id` = %d",
 					intval($parent["id"]),
@@ -229,7 +236,9 @@ function complete_conversation($itemid, $conversation_url, $only_add_conversatio
 		$arr["author-avatar"] = $single_conv->actor->image->url;
 		$arr["body"] = html2bbcode($single_conv->content);
 
-		if (isset($single_conv->statusnet->notice_info->source))
+		if (isset($single_conv->status_net->notice_info->source))
+			$arr["app"] = strip_tags($single_conv->status_net->notice_info->source);
+		elseif (isset($single_conv->statusnet->notice_info->source))
 			$arr["app"] = strip_tags($single_conv->statusnet->notice_info->source);
 		elseif (isset($single_conv->statusnet_notice_info->source))
 			$arr["app"] = strip_tags($single_conv->statusnet_notice_info->source);