diff --git a/.classpath b/.classpath
index dda1718..4013f6e 100644
--- a/.classpath
+++ b/.classpath
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="src" output="target/invite-friends-vre-1.0.1-SNAPSHOT/WEB-INF/classes" path="src/main/java">
+	<classpathentry kind="src" output="target/invite-friends-vre-1.1.0-SNAPSHOT/WEB-INF/classes" path="src/main/java">
 		<attributes>
 			<attribute name="optional" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry excluding="**" kind="src" output="target/invite-friends-vre-1.0.1-SNAPSHOT/WEB-INF/classes" path="src/main/resources">
+	<classpathentry excluding="**" kind="src" output="target/invite-friends-vre-1.1.0-SNAPSHOT/WEB-INF/classes" path="src/main/resources">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
@@ -33,5 +33,5 @@
 			<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="output" path="target/invite-friends-vre-1.0.1-SNAPSHOT/WEB-INF/classes"/>
+	<classpathentry kind="output" path="target/invite-friends-vre-1.1.0-SNAPSHOT/WEB-INF/classes"/>
 </classpath>
diff --git a/pom.xml b/pom.xml
index 2b105f9..5a83021 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,8 +23,6 @@
 	<properties>
 		<!-- Convenience property to set the GWT version -->
 		<gwtVersion>2.7.0</gwtVersion>
-
-		<!-- GWT needs at least java 1.6 -->
 		<maven.compiler.source>1.7</maven.compiler.source>
 		<maven.compiler.target>1.7</maven.compiler.target>
 
@@ -81,6 +79,15 @@
 			<artifactId>invites-common-library</artifactId>
 			<version>[0.1.0-SNAPSHOT,)</version>
 		</dependency>
+		<dependency>
+			<groupId>org.gcube.portal</groupId>
+			<artifactId>social-networking-library</artifactId>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.google</groupId>
+			<artifactId>gwt-jsonmaker</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>com.github.gwtbootstrap</groupId>
 			<artifactId>gwt-bootstrap</artifactId>
@@ -159,7 +166,7 @@
 						<goals>
 							<goal>compile</goal>
 							<!-- <goal>test</goal> -->
-<!-- 							<goal>generateAsync</goal> -->
+							<!-- <goal>generateAsync</goal> -->
 						</goals>
 					</execution>
 				</executions>
diff --git a/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteService.java b/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteService.java
index 5331df0..fc45c03 100644
--- a/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteService.java
+++ b/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteService.java
@@ -1,5 +1,7 @@
 package org.gcube.portlets.user.invitefriends.client;
 
+import org.gcube.portal.databook.shared.InviteOperationResult;
+
 import com.google.gwt.user.client.rpc.RemoteService;
 import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
 
@@ -8,5 +10,5 @@ import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
  */
 @RemoteServiceRelativePath("greet")
 public interface InviteService extends RemoteService {
-  Boolean sendInviteEmail(String name, String lastName, String email) throws IllegalArgumentException;
+	InviteOperationResult sendInvite(String name, String lastName, String email) throws IllegalArgumentException;
 }
diff --git a/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteServiceAsync.java b/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteServiceAsync.java
index a8a4dcb..7427fbb 100644
--- a/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteServiceAsync.java
+++ b/src/main/java/org/gcube/portlets/user/invitefriends/client/InviteServiceAsync.java
@@ -1,9 +1,12 @@
 package org.gcube.portlets.user.invitefriends.client;
 
+import org.gcube.portal.databook.shared.InviteOperationResult;
+
 import com.google.gwt.user.client.rpc.AsyncCallback;
 
 public interface InviteServiceAsync {
 
-	void sendInviteEmail(String name, String lastName, String email, AsyncCallback<Boolean> callback);
+	void sendInvite(String name, String lastName, String email,
+			AsyncCallback<InviteOperationResult> callback);
 
 }
diff --git a/src/main/java/org/gcube/portlets/user/invitefriends/client/ui/FormViewImpl.java b/src/main/java/org/gcube/portlets/user/invitefriends/client/ui/FormViewImpl.java
index 44e0165..6f8de33 100644
--- a/src/main/java/org/gcube/portlets/user/invitefriends/client/ui/FormViewImpl.java
+++ b/src/main/java/org/gcube/portlets/user/invitefriends/client/ui/FormViewImpl.java
@@ -3,6 +3,7 @@
  */
 package org.gcube.portlets.user.invitefriends.client.ui;
 
+import org.gcube.portal.databook.shared.InviteOperationResult;
 import org.gcube.portlets.user.invitefriends.client.InviteService;
 import org.gcube.portlets.user.invitefriends.client.InviteServiceAsync;
 import org.gcube.portlets.user.invitefriends.client.validation.FormView;
@@ -115,12 +116,24 @@ public class FormViewImpl extends Composite implements FormView, Editor<FormView
 		} else {
 			nameGroup.setType(ControlGroupType.NONE);
 			nameErrors.setText("");
-			service.sendInviteEmail(name.getText(), "", email.getText(), new AsyncCallback<Boolean>() {
+			service.sendInvite(name.getText(), "", email.getText(), new AsyncCallback<InviteOperationResult>() {
 
 				@Override
-				public void onSuccess(Boolean result) {
-					feedback.setText("Thanks for inviting, we sent the email correctly.");	
-					feedbackGroup.setType(ControlGroupType.SUCCESS);
+				public void onSuccess(InviteOperationResult result) {
+					switch (result) {
+					case SUCCESS:
+						feedback.setText("Thanks for inviting, we sent the email correctly.");	
+						feedbackGroup.setType(ControlGroupType.SUCCESS);
+						break;
+					case ALREADY_INVITED:
+						feedback.setText("Thanks for inviting, however the user was already invited.");	
+						feedbackGroup.setType(ControlGroupType.WARNING);
+						break;
+					case FAILED:
+						feedback.setText("Sorry, an error occurred in the server and we could not send the invite, please try again later.");	
+						feedbackGroup.setType(ControlGroupType.ERROR);
+						break;
+					}					
 					sendInvite.setEnabled(false);
 					cancelInvite.setText("Close");
 					email.setText("");
@@ -130,7 +143,7 @@ public class FormViewImpl extends Composite implements FormView, Editor<FormView
 				public void onFailure(Throwable caught) {
 					feedback.setText("Sorry, an error occurred and we could not send the invite, please try again later.");	
 					feedbackGroup.setType(ControlGroupType.ERROR);
-					sendInvite.removeFromParent();
+					sendInvite.setEnabled(false);
 					email.setText("");
 				}
 			});
diff --git a/src/main/java/org/gcube/portlets/user/invitefriends/server/InviteServiceImpl.java b/src/main/java/org/gcube/portlets/user/invitefriends/server/InviteServiceImpl.java
index 0d57aad..dc09909 100644
--- a/src/main/java/org/gcube/portlets/user/invitefriends/server/InviteServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/invitefriends/server/InviteServiceImpl.java
@@ -5,6 +5,7 @@ import org.gcube.application.framework.core.session.SessionManager;
 import org.gcube.common.portal.PortalContext;
 import org.gcube.portal.custom.communitymanager.OrganizationsUtil;
 import org.gcube.portal.custom.scopemanager.scopehelper.ScopeHelper;
+import org.gcube.portal.databook.shared.InviteOperationResult;
 import org.gcube.portal.invites.InvitesManager;
 import org.gcube.portlets.user.invitefriends.client.InviteService;
 import org.slf4j.Logger;
@@ -42,7 +43,7 @@ public class InviteServiceImpl extends RemoteServiceServlet implements InviteSer
 	 * 
 	 */
 	@Override
-	public Boolean sendInviteEmail(String name, String lastName, String email) throws IllegalArgumentException {
+	public InviteOperationResult sendInvite(String name, String lastName, String email) throws IllegalArgumentException {
 		ASLSession aslSession = getASLSession();
 		String fromFullName = aslSession.getUserFullName(); 
 	
@@ -58,7 +59,7 @@ public class InviteServiceImpl extends RemoteServiceServlet implements InviteSer
 			return null;
 		} 
 		String portalSenderEmail = PortalContext.getConfiguration().getSenderEmail();
-		return InvitesManager.getInstance().sendInviteEmail(aslSession, portalSenderEmail, portalUrl, fromFullName, lastName, email, vreDescription);
+		return InvitesManager.getInstance().sendInvite(aslSession, portalSenderEmail, portalUrl, fromFullName, lastName, email, vreDescription);
 	}
 	
 
diff --git a/src/main/resources/org/gcube/portlets/user/invitefriends/InviteFriends.gwt.xml b/src/main/resources/org/gcube/portlets/user/invitefriends/InviteFriends.gwt.xml
index d46ea40..a187d24 100644
--- a/src/main/resources/org/gcube/portlets/user/invitefriends/InviteFriends.gwt.xml
+++ b/src/main/resources/org/gcube/portlets/user/invitefriends/InviteFriends.gwt.xml
@@ -2,11 +2,12 @@
 <module rename-to='invitefriends'>
 	<!-- Inherit the core Web Toolkit stuff. -->
 	<inherits name='com.google.gwt.user.User' />
-	<inherits name='com.google.gwt.activity.Activity' /> 
+	<inherits name='com.google.gwt.activity.Activity' />
 	<inherits name="com.github.gwtbootstrap.Bootstrap" />
 
 	<!-- Other module inherits -->
-
+	<inherits name="org.jsonmaker.gwt.Gwt_jsonmaker" />
+	<inherits name='org.gcube.portal.databook.GCubeSocialNetworking' />
 	<!-- Specify the app entry point class. -->
 	<entry-point
 		class='org.gcube.portlets.user.invitefriends.client.InviteFriends' />