public void Init()
 {
     FacebookService.Init();
 }
 public void InviteFriend()
 {
     FacebookService.GetFacebookFriends();
 }
 public void LogOut()
 {
     FacebookService.FacebookLogout();
 }
 public void Share()
 {
     FacebookService.FacebookShareFriend();
 }
 public void LogIn()
 {
     FacebookService.FacebookLogin();
 }