diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/AslNewsManager.java b/src/main/java/org/gcube/applicationsupportlayer/social/AslNewsManager.java
index 11cdc56..066f8fb 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/AslNewsManager.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/AslNewsManager.java
@@ -1,23 +1,14 @@
 package org.gcube.applicationsupportlayer.social;
 
 import java.util.Date;
-import java.util.HashMap;
 import java.util.List;
 import java.util.UUID;
 
 import org.gcube.application.framework.core.session.ASLSession;
 import org.gcube.common.core.contexts.GHNContext;
-import org.gcube.common.core.informationsystem.ISException;
-import org.gcube.common.core.informationsystem.client.AtomicCondition;
 import org.gcube.common.core.informationsystem.client.ISClient;
 import org.gcube.common.core.informationsystem.client.XMLResult;
-import org.gcube.common.core.informationsystem.client.ISClient.ISMalformedQueryException;
-import org.gcube.common.core.informationsystem.client.ISClient.ISUnsupportedQueryException;
 import org.gcube.common.core.informationsystem.client.queries.GCUBEGenericQuery;
-import org.gcube.common.core.informationsystem.client.queries.GCUBEGenericResourceQuery;
-import org.gcube.common.core.resources.GCUBEGenericResource;
-import org.gcube.common.core.scope.GCUBEScope;
-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.Application;
@@ -35,17 +26,14 @@ import org.gcube.portlets.user.homelibrary.home.data.application.ApplicationData
  */
 public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 
-	GCUBEClientLog log = new GCUBEClientLog(AslNewsManager.class);
-
-	private ASLSession session;
 	private Application application;
 	/**
 	 * 
-	 * @param session the ASLSession instance
+	 * @param aslSession the ASLSession instance
 	 * @param applicationClass your servlet class name will be used ad unique identifier for your application
 	 */
 	public AslNewsManager(ASLSession session, Class<?> applicationClass) {
-		this.session = session;
+		super(session);
 		this.application = getProfileFromInfrastrucure(applicationClass);
 	}	
 	/**
@@ -65,7 +53,7 @@ public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 					" eq '" + applicationClass.getName() + "'" +
 					"return $profile");
 			
-			List<XMLResult> appProfile = client.execute(query, session.getScope().getInfrastructure());
+			List<XMLResult> appProfile = client.execute(query, aslSession.getScope().getInfrastructure());
 			if (appProfile == null || appProfile.size() == 0) 
 				throw new ApplicationDataNotFoundException("Your application is not registered in the infrastructure");
 			else {
@@ -81,7 +69,7 @@ public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 				if (currValue != null && currValue.size() > 0) {
 					toReturn.setDescription(currValue.get(0));
 				} 
-				else log.warn("No Description exists for " + toReturn.getName());
+				else _log.warn("No Description exists for " + toReturn.getName());
 			
 				currValue = node.evaluate("/Resource/Profile/Body/AppId/text()");
 				if (currValue != null && currValue.size() > 0) {
@@ -98,7 +86,7 @@ public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 			}
 			
 		} catch (Exception e) {
-			log.error("Error while trying to fetch application profile from the infrastructure");
+			_log.error("Error while trying to fetch application profile from the infrastructure");
 			e.printStackTrace();
 			return null;
 		} 
@@ -116,7 +104,7 @@ public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 				FeedType.PUBLISH, 
 				application.getName(), 
 				new Date(), 
-				getScopeByOrganizationId(""+session.getGroupId()), 
+				getScopeByOrganizationId(""+aslSession.getGroupId()), 
 				"", 
 				"", 
 				descToAdd, 
@@ -128,7 +116,7 @@ public class AslNewsManager extends SocialPortalBridge implements NewsManager  {
 				"linkDescription", 
 				"linkHost");
 
-		return store.saveAppFeed(toShare);
+		return getStoreInstance().saveAppFeed(toShare);
 	}
 	/**
 	 * {@inheritDoc}
diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java b/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
index 60e3cd4..f12ff49 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/AslNotificationManager.java
@@ -1,9 +1,6 @@
 package org.gcube.applicationsupportlayer.social;
 
 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;
@@ -17,12 +14,9 @@ import org.gcube.portlets.user.homelibrary.home.workspace.sharing.WorkspaceMessa
  * use to notify users from within your application 
  */
 public class AslNotificationManager extends SocialPortalBridge implements NotificationManager {
-	GCUBEClientLog log = new GCUBEClientLog(AslNotificationManager.class);
 
-	private ASLSession session;
-	
 	public AslNotificationManager(ASLSession session) {
-		this.session = session;
+		super(session);
 	}
 	/**
 	 * {@inheritDoc}
diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/SocialPortalBridge.java b/src/main/java/org/gcube/applicationsupportlayer/social/SocialPortalBridge.java
index 6f95049..84a17ee 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/SocialPortalBridge.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/SocialPortalBridge.java
@@ -1,5 +1,6 @@
 package org.gcube.applicationsupportlayer.social;
 
+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;
@@ -13,14 +14,23 @@ import org.gcube.vomanagement.usermanagement.impl.liferay.LiferayGroupManager;
  * use to notify users from within your application 
  */
 public abstract class SocialPortalBridge {
-	
-	private GCUBEClientLog _log = new GCUBEClientLog(SocialPortalBridge.class);
-	protected DatabookStore store;
-	
-	public SocialPortalBridge() {
-		store = new DBCassandraAstyanaxImpl();
+
+	protected static GCUBEClientLog _log = new GCUBEClientLog(SocialPortalBridge.class);
+	protected ASLSession aslSession;
+	//unique instance
+	private static DatabookStore store;
+
+	public SocialPortalBridge(ASLSession session) {
+		this.aslSession = session;
 	}
-	
+
+	public static synchronized DatabookStore getStoreInstance() {
+		if (store == null) {
+			store = new DBCassandraAstyanaxImpl();
+		}
+		return store;
+	}
+
 	String getScopeByOrganizationId(String vreid) {
 		GroupManager gm = new LiferayGroupManager();
 		try {