diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java b/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
index f9c7963..9ebfe5c 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
@@ -4,8 +4,11 @@ import org.gcube.application.framework.core.session.ASLSession;
 import org.gcube.common.core.utils.logging.GCUBEClientLog;
 import org.gcube.portal.databook.server.DBCassandraAstyanaxImpl;
 import org.gcube.portal.databook.server.DatabookStore;
+import org.gcube.portal.databook.shared.Comment;
+import org.gcube.portal.databook.shared.Feed;
 import org.gcube.portlets.user.homelibrary.home.workspace.WorkspaceFolder;
 import org.gcube.portlets.user.homelibrary.home.workspace.WorkspaceItem;
+import org.gcube.portlets.user.homelibrary.home.workspace.sharing.WorkspaceMessage;
 /**
  * 
  * @author Massimiliano Assante, ISTI-CNR
@@ -53,4 +56,25 @@ public class AslNotificationManager implements NotificationManager {
 		return true;
 	}
 
+	@Override
+	public boolean notifyMessageReceived(String userIdToNotify,	WorkspaceMessage message) {
+		return true;
+	}
+
+	@Override
+	public boolean notifyOwnCommentReply(String userIdToNotify, Comment comment) {
+		return true;
+	}
+
+	@Override
+	public boolean notifyCommentReply(String userIdToNotify, Comment comment) {
+		return true;
+	}
+
+	@Override
+	public boolean notifyLikedFeed(String userIdToNotify, Feed likedFeed) {
+		return true;
+	}
+	
+
 }
diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java b/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
index fa84104..bb05af7 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
@@ -1,7 +1,10 @@
 package org.gcube.applicationsupportlayer.social;
 
+import org.gcube.portal.databook.shared.Comment;
+import org.gcube.portal.databook.shared.Feed;
 import org.gcube.portlets.user.homelibrary.home.workspace.WorkspaceFolder;
 import org.gcube.portlets.user.homelibrary.home.workspace.WorkspaceItem;
+import org.gcube.portlets.user.homelibrary.home.workspace.sharing.WorkspaceMessage;
 /**
  * 
  * @author Massimiliano Assante, ISTI-CNR
@@ -14,7 +17,7 @@ public interface NotificationManager {
 	 *
 	 * @param userIdToNotify the user you want to notify
 	 * @param sharedFolder the shared {@link WorkspaceFolder}  
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyFolderSharing(String userIdToNotify, WorkspaceFolder sharedFolder);
 	/**
@@ -23,7 +26,7 @@ public interface NotificationManager {
 	 * @param userIdToNotify the user you want to notify
 	 * @param sharedFolder the shared {@link WorkspaceFolder}  
 	 * @param newAddedUserId the new user that was added
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyFolderAddedUser(String userIdToNotify, WorkspaceFolder sharedFolder, String newAddedUserId);
 	/**
@@ -32,29 +35,59 @@ public interface NotificationManager {
 	 * @param userIdToNotify the user you want to notify
 	 * @param sharedFolder the shared {@link WorkspaceFolder}  
 	 * @param removedUserId the new user that was removed
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyFolderRemovedUser(String userIdToNotify, WorkspaceFolder sharedFolder, String removedUserId);	
 	/**
 	 * use to notify a user he got a workspace item new in some of his workspace shared folder
-	 * @param userIdToNotify
+	 * @param userIdToNotify the user you want to notify
 	 * @param newItem the new shared {@link WorkspaceItem}  
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyAddedItem(String userIdToNotify, WorkspaceItem newItem);
 	/**
 	 * use to notify a user he got a workspace item deleted from one of his workspace shared folder
-	 * @param userIdToNotify
+	 * @param userIdToNotify the user you want to notify
 	 * @param removedItem the removed {@link WorkspaceItem}  
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyRemovedItem(String userIdToNotify, WorkspaceItem removedItem);
 	/**
 	 * use to notify a user he got a workspace item updated from one of his workspace shared folder
-	 * @param userIdToNotify
-	 * @param newItem the new shared {@link WorkspaceItem}  
-	 * @return true id the notification is correctly delivered, false otherwise
+	 * @param userIdToNotify the user you want to notify
+	 * @param updatedItem the updated shared {@link WorkspaceItem}  
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyUpdatedItem(String userIdToNotify, WorkspaceItem updatedItem);
+	/**
+	 * 
+	 * @param userIdToNotify the user you want to notify
+	 * @param message the {@link WorkspaceMessage} sent
+	 * @return true if the notification is correctly delivered, false otherwise
+	 */
+	boolean notifyMessageReceived(String userIdToNotify, WorkspaceMessage message);
+	/**
+	 * 
+	 * @param userIdToNotify the user you want to notify
+	 * @param comment the {@link Comment} instance to which someone replied to
+	 * @return true if the notification is correctly delivered, false otherwise
+	 */
+	boolean notifyOwnCommentReply(String userIdToNotify, Comment comment);
+	/**
+	 * use to notify a user that commented on a feed (Not his) that someone commented too 
+	 * 
+	 * @param userIdToNotify the user you want to notify
+	 * @param comment the {@link Comment} instance to which someone replied to
+	 * @return true if the notification is correctly delivered, false otherwise
+	 */
+	boolean notifyCommentReply(String userIdToNotify, Comment comment);
+	/**
+	 * use to notify a user he got one of his feed liked
+	 *  
+	 * @param userIdToNotify the user you want to notify
+	 * @param likedFeed the {@link Feed} instance someone liked
+	 * @return
+	 */
+	boolean notifyLikedFeed(String userIdToNotify, Feed likedFeed);
 	
 }