public void InviteFriends(OnRequestDelegate callback)
{
if (callback != null)
{
this.InviteFriendsCB = callback;
}
Lang lang = Service.Lang;
string message = lang.Get("FB_INVITE_MESSAGE", new object[0]);
string title = lang.Get("FB_INVITE_TITLE", new object[0]);
FacebookManager.InviteFriends(message, title, new FacebookDelegate <IAppRequestResult>(this.OnFacebookInviteFriends));
}