diff --git a/include/acl_selectors.php b/include/acl_selectors.php
index ee74ccc16..0a9b2c90a 100644
--- a/include/acl_selectors.php
+++ b/include/acl_selectors.php
@@ -382,7 +382,7 @@ function acl_lookup(&$a, $out_type = 'json') {
 	$count = (x($_REQUEST,'count')?$_REQUEST['count']:100);
 	$search = (x($_REQUEST,'search')?$_REQUEST['search']:"");
 	$type = (x($_REQUEST,'type')?$_REQUEST['type']:"");
-	
+	$conv_id = (x($_REQUEST,'conversation')?$_REQUEST['conversation']:null);
 
 	// For use with jquery.autocomplete for private mail completion
 
@@ -450,6 +450,7 @@ function acl_lookup(&$a, $out_type = 'json') {
 		$contact_count = 0;
 	}
 	
+	
 	$tot = $group_count+$contact_count;
 	
 	$groups = array();
@@ -553,6 +554,52 @@ function acl_lookup(&$a, $out_type = 'json') {
 		
 	$items = array_merge($groups, $contacts);
 
+	if ($conv_id) {
+		/* if $conv_id is set, get unknow contacts in thread */ 
+		/* but first get know contacts url to filter them out */
+		function _contact_link($i){ return dbesc($i['link']); }
+		$known_contacts = array_map(_contact_link, $contacts);
+		$unknow_contacts=array();
+		$r = q("select 
+					`author-avatar`,`author-name`,`author-link`
+				from item where parent=%d
+				and (
+					`author-name` LIKE '%%%s%%' OR
+					`author-link` LIKE '%%%s%%'
+				) and 
+				`author-link` NOT IN ('%s')
+				GROUP BY `author-link`
+				ORDER BY `author-name` ASC
+				", 
+				intval($conv_id),
+				dbesc($search),
+				dbesc($search),
+				implode("','", $known_contacts)
+		);
+		if (is_array($r) && count($r)){
+			foreach($r as $row) {
+				// nickname..
+				$up = parse_url($row['author-link']);
+				$nick = explode("/",$up['path']);
+				$nick = $nick[count($nick)-1];
+				$nick .= "@".$up['host'];
+				// /nickname
+				$unknow_contacts[] = array(
+					"type"  => "c",
+					"photo" => $row['author-avatar'],
+					"name"  => $row['author-name'],
+					"id"	=> '',
+					"network" => "unknown",
+					"link" => $row['author-link'],
+					"nick" => $nick,
+					"forum" => false
+				);
+			}
+		}
+
+		$items = array_merge($items, $unknow_contacts);
+		$tot += count($unknow_contacts);
+	}
 
 	if($out_type === 'html') {
 		$o = array(
diff --git a/include/session.php b/include/session.php
index df3871bd7..6632b7e89 100644
--- a/include/session.php
+++ b/include/session.php
@@ -19,6 +19,8 @@ function ref_session_read ($id) {
   if(count($r)) {
     $session_exists = true;
     return $r[0]['data'];
+  } else {
+    logger("no data for session $id", LOGGER_TRACE);
   }
   return '';
 }}
diff --git a/include/template_processor.php b/include/template_processor.php
index 49d37488f..27271e2ed 100644
--- a/include/template_processor.php
+++ b/include/template_processor.php
@@ -1,4 +1,9 @@
 <?php
+/*
+ * This is the old template engine, now deprecated.
+ * Friendica's default template engine is Smarty3 (see include/friendica_smarty.php)
+ * 
+ */
 require_once 'object/TemplateEngine.php';
 
 define("KEY_NOT_EXISTS", '^R_key_not_Exists^');
diff --git a/include/text.php b/include/text.php
index d515f28ca..2490bf402 100644
--- a/include/text.php
+++ b/include/text.php
@@ -1,13 +1,5 @@
 <?php
 
-// This is our template processor.
-// $s is the string requiring macro substitution.
-// $r is an array of key value pairs (search => replace)
-// returns substituted string.
-// WARNING: this is pretty basic, and doesn't properly handle search strings that are substrings of each other.
-// For instance if 'test' => "foo" and 'testing' => "bar", testing could become either bar or fooing, 
-// depending on the order in which they were declared in the array.
-
 require_once("include/template_processor.php");
 require_once("include/friendica_smarty.php");
 
@@ -661,6 +653,9 @@ function attribute_contains($attr,$s) {
 }}
 
 if(! function_exists('logger')) {
+/* setup int->string log level map */
+$LOGGER_LEVELS = array();
+	
 /**
  * log levels:
  * LOGGER_NORMAL (default)
@@ -678,9 +673,16 @@ function logger($msg,$level = 0) {
 	// turn off logger in install mode
 	global $a;
 	global $db;
-
+	global $LOGGER_LEVELS;
+	
 	if(($a->module == 'install') || (! ($db && $db->connected))) return;
 
+    if (count($LOGGER_LEVEL)==0){
+        foreach (get_defined_constants() as $k=>$v){
+            if (substr($k,0,7)=="LOGGER_") $LOGGER_LEVELS[$v] = substr($k,7,7);
+        }        
+    }
+    
 	$debugging = get_config('system','debugging');
 	$loglevel  = intval(get_config('system','loglevel'));
 	$logfile   = get_config('system','logfile');
@@ -688,8 +690,19 @@ function logger($msg,$level = 0) {
 	if((! $debugging) || (! $logfile) || ($level > $loglevel))
 		return;
 
+	$callers = debug_backtrace(); 
+	$logline =  sprintf("%s@%s\t[%s]:%s:%s:%s\t%s\n", 
+				 datetime_convert(), 
+				 session_id(),
+				 $LOGGER_LEVELS[$level],
+				 basename($callers[0]['file']),
+				 $callers[0]['line'],
+				 $callers[1]['function'],
+				 $msg
+				);
+	
 	$stamp1 = microtime(true);
-	@file_put_contents($logfile, datetime_convert() . ':' . session_id() . ' ' . $msg . "\n", FILE_APPEND);
+	@file_put_contents($logfile, $logline, FILE_APPEND);
 	$a->save_timestamp($stamp1, "file");
 	return;
 }}
diff --git a/js/fk.autocomplete.js b/js/fk.autocomplete.js
index 2334bb4a2..cf6fd25cb 100644
--- a/js/fk.autocomplete.js
+++ b/js/fk.autocomplete.js
@@ -14,6 +14,11 @@ function ACPopup(elm,backend_url){
 	this.kp_timer = false;
 	this.url = backend_url;
 
+	this.conversation_id = null;
+	var conv_id = this.element.id.match(/\d+$/);
+	if (conv_id) this.conversation_id = conv_id[0];
+	console.log("ACPopup elm id",this.element.id,"conversation",this.conversation_id);
+
 	var w = 530;
 	var h = 130;
 
@@ -67,6 +72,7 @@ ACPopup.prototype._search = function(){
 		count:100,
 		search:this.searchText,
 		type:'c',
+		conversation: this.conversation_id,
 	}
 	
 	$.ajax({
@@ -79,8 +85,10 @@ ACPopup.prototype._search = function(){
 			if (data.tot>0){
 				that.cont.show();
 				$(data.items).each(function(){
-					html = "<img src='{0}' height='16px' width='16px'>{1} ({2})".format(this.photo, this.name, this.nick)
-						that.add(html, this.nick.replace(' ','') + '+' + this.id + ' - ' + this.link);
+					var html = "<img src='{0}' height='16px' width='16px'>{1} ({2})".format(this.photo, this.name, this.nick);
+					var nick = this.nick.replace(' ','');
+					if (this.id!=='')  nick += '+' + this.id; 
+					that.add(html, nick + ' - ' + this.link);
 				});			
 			} else {
 				that.cont.hide();