diff --git a/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Comments.java b/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Comments.java
index 2a27812..eec4b94 100644
--- a/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Comments.java
+++ b/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Comments.java
@@ -200,7 +200,7 @@ public class Comments {
 			String userid = username;
 			Date time = new Date();
 
-			String postOwnerId = CassandraConnection.getInstance().getDatabookStore().readPost(postId).getKey();
+			String postOwnerId = CassandraConnection.getInstance().getDatabookStore().readPost(postId).getEntityId();
 			Comment theComment = SocialUtils.commentPost(userid, time, postId, commentText, postOwnerId, context);
 			if (theComment != null)
 				logger.info("Added comment " + theComment.toString());
diff --git a/src/main/java/org/gcube/portal/social/networking/ws/utils/SocialUtils.java b/src/main/java/org/gcube/portal/social/networking/ws/utils/SocialUtils.java
index 10fd727..c1b6e91 100644
--- a/src/main/java/org/gcube/portal/social/networking/ws/utils/SocialUtils.java
+++ b/src/main/java/org/gcube/portal/social/networking/ws/utils/SocialUtils.java
@@ -556,10 +556,10 @@ public class SocialUtils {
 		//if the comment was correctly delivered notify users involved
 		SocialNetworkingUser socialUser = new SocialNetworkingUser(userid, email, fullName, thumbnailURL);
 		
-		NotificationsManager nm = new ApplicationNotificationsManager(UserManagerWSBuilder.getInstance().getUserManager(), site, context, socialUser, NEWS_FEED_PORTLET_CLASSNAME);
+		NotificationsManager nm = new ApplicationNotificationsManager(uManager, site, context, socialUser, NEWS_FEED_PORTLET_CLASSNAME);
 
 		//if the user who commented this post is not the user who posted it notify the poster user (Post owner) 
-		if (! user.getUsername().equals(postOwnerId)) {				
+		if (! user.getUsername().equals(postOwnerId)) {	
 			boolean resultNotifyOwnComment = nm.notifyOwnCommentReply(postOwnerId, postId, escapedCommentText, theComment.getKey());
 			logger.info("Comment Notification to post owner added? " + resultNotifyOwnComment);
 		} 
@@ -569,10 +569,10 @@ public class SocialUtils {
 		likesThread.start();
 		
 		//notify the other users who commented this post (excluding the ones above)
-//		Thread commentsNotificationthread = new Thread(new CommentNotificationsThread(
-//				CassandraConnection.getInstance().getDatabookStore(),
-//				uManager, user.getUsername(), theComment.getFeedid(), escapedCommentText, nm, postOwnerId,  theComment.getKey(), likes));
-//		commentsNotificationthread.start();	
+		Thread commentsNotificationthread = new Thread(new CommentNotificationsThread(
+				CassandraConnection.getInstance().getDatabookStore(),
+				uManager, user.getUsername(), theComment.getFeedid(), escapedCommentText, nm, postOwnerId,  theComment.getKey(), likes));
+		commentsNotificationthread.start();	
 
 		//send the notification to the mentioned users, if any
 		if (mentionedUsers != null && mentionedUsers.size() > 0) {