diff --git a/inc/Spot.php b/inc/Spot.php
index 75d639c..130d958 100755
--- a/inc/Spot.php
+++ b/inc/Spot.php
@@ -224,7 +224,7 @@ class Spot extends Main
 			$oEmail->oTemplate->setTag('date_time', 'time:'.$asLastMessage['unix_time'], 'd/m/Y, H:i');
 
 			//Add latest news feed
-			$asNews = $this->getNewsFeed(0, true);
+			$asNews = $this->getNewsFeed(0, 0, true);
 			$iPostCount = 0;
 			foreach($asNews as $asPost) {
 				if($asPost['type'] != 'message') {
@@ -425,7 +425,7 @@ class Spot extends Main
 		if($sTimeZone != '') $asData['formatted_time_local'] = $this->getTimeFormat($iTime, $sTimeZone);
 	}
 
-	public function getNewsFeed($iChunk=0, $bInternal=false)
+	public function getNewsFeed($iChunk=0, $iRefTimePoint=0, $bInternal=false)
 	{
 		$bHistoMode = ($this->oProject->getMode() == Project::MODE_HISTO);
 		$asFeeds = array();
@@ -435,7 +435,7 @@ class Spot extends Main
 				'feed'		=> $this->getSpotMessages(),
 				'priority'	=> 0
 			),
-			'media'	=> array(
+			'media'		=> array(
 				'table'		=> Media::MEDIA_TABLE,
 				'feed'		=> $this->getMedias('posted_on'),
 				'priority'	=> 1
@@ -448,25 +448,31 @@ class Spot extends Main
 		);
 		foreach($asFeedTypes as $sFeedType=>$asFeedTypeInfo) {
 			foreach($asFeedTypeInfo['feed'] as $asFeed) {
-				$sPriority = $asFeedTypeInfo['priority'];
-				if($bHistoMode) $sPriority = count($asFeedTypes) - 1 - $asFeedTypeInfo['priority'];
-
 				$iTableId = $asFeed[Db::getId($asFeedTypeInfo['table'])];
-				$iId = ($asFeed['unix_time'] * -1).'.'.$sPriority.$iTableId;
-				$asFeeds[$iId] = $asFeed;
-				$asFeeds[$iId]['type'] = $sFeedType;
-				$asFeeds[$iId]['id'] = $iTableId;
+
+				//Build unique sorting ID
+				$iSort = $asFeed['unix_time'].'.'.$asFeedTypeInfo['priority'].$iTableId;
+
+				//Build feed (not including new feeds added in between chunk by concurrent access)
+                if($iChunk == 0 || $iSort <= $iRefTimePoint) {
+                    $asFeeds[$iSort] = $asFeed;
+                    $asFeeds[$iSort]['type'] = $sFeedType;
+                    $asFeeds[$iSort]['id'] = $iTableId;
+                }
+
+				//Build Reference Time Point (latest item extracted by first chunk)
+				if($iChunk == 0 && $iSort > $iRefTimePoint) $iRefTimePoint = $iSort;
 			}
 		}
 
 		//Sort by key
-		if($bHistoMode)	krsort($asFeeds);
-		else ksort($asFeeds);
+		if($bHistoMode)	ksort($asFeeds); 	//Old first
+		else krsort($asFeeds);				//New first
 
 		//Split chunks
 		$asFeeds = array_slice($asFeeds, $iChunk * self::FEED_CHUNK_SIZE, self::FEED_CHUNK_SIZE);
 
-		return $bInternal?$asFeeds:self::getJsonResult(true, '', $asFeeds);
+		return $bInternal?$asFeeds:self::getJsonResult(true, '', array('ref_id'=>$iRefTimePoint, 'feed' => $asFeeds));
 	}
 
 	public function syncMedias() {
diff --git a/index.php b/index.php
index 8782b59..1f3f54f 100755
--- a/index.php
+++ b/index.php
@@ -45,7 +45,7 @@ if($sAction!='')
 			$sResult = $oSpot->getMarkers();
 			break;
 		case 'feed':
-			$sResult = $oSpot->getNewsFeed($iChunk);
+			$sResult = $oSpot->getNewsFeed($iChunk, $iId);
 			break;
 		case 'add_post':
 			$sResult = $oSpot->addPost($sName, $sContent);
diff --git a/masks/project.html b/masks/project.html
index 9858541..078cf5f 100644
--- a/masks/project.html
+++ b/masks/project.html
@@ -720,6 +720,8 @@ function updateFeed(bFirstChunk, bDiscrete, fCallback) {
 	bDiscrete = bDiscrete || false;
 	fCallback = fCallback || function(){};
 
+	if(bFirstChunk) self.tmp('ref_id', 0);
+
 	if(self.tmp('updatable')) {
 		if(!self.tmp('out-of-data') || bFirstChunk) {
 			self.tmp('updatable', false);
@@ -736,12 +738,14 @@ function updateFeed(bFirstChunk, bDiscrete, fCallback) {
 				function(asData) {
 					$('#loading').hide();
 
-					$.each(asData, function(iKey, asPost){
+					self.tmp('ref_id', asData.ref_id);
+
+					$.each(asData.feed, function(iKey, asPost){
 						$Posts.append(getPost(asPost));
 					});
 
 					self.tmp('news_chunk', self.tmp('news_chunk') + 1);
-					self.tmp('out-of-data', Object.keys(asData).length != self.vars('chunk_size'));
+					self.tmp('out-of-data', Object.keys(asData.feed).length != self.vars('chunk_size'));
 
 					if(bFirstChunk===true) self.tmp('$PostList').empty();
 					self.tmp('$PostList').append($Posts.children());
@@ -751,7 +755,8 @@ function updateFeed(bFirstChunk, bDiscrete, fCallback) {
 					self.tmp('updatable', true);
 				}, {
 					id_project: self.vars(['project', 'id']),
-					chunk: self.tmp('news_chunk')
+					chunk: self.tmp('news_chunk'),
+					id: self.tmp('ref_id')
 				}
 			);
 		}