public void Logout()
 {
     FaceBookServiceFacade.Logout();
     LoggedInUser = null;
     LoginResult  = null;
     AppSettingsInstance.RememberUser = false;
 }
 public void Login()
 {
     LoginResult  = FaceBookServiceFacade.Login();
     LoggedInUser = LoginResult.LoggedInUser;
     foreach (User friend in LoggedInUser.Friends)
     {
         m_LoggedInUserFriends.Add(friend);
     }
 }