if (!FB.IsLoggedIn) {
            //START
            if (GUI.Button(new Rect(Screen.width * 0.55f, Screen.height * 0.7f, Screen.height * 0.2f * (float)1920/700, Screen.height * 0.2f), "", "Enter"))
            {
                if (!FB.IsLoggedIn) {
                    Init.Start();
                }
            }
            return;
        }

if (!FB.IsLoggedIn) {
        //START
        if (GUI.Button(new Rect(Screen.width * 0.55f, Screen.height * 0.7f, Screen.height * 0.2f * (float)1920/700, Screen.height * 0.2f), "", "Enter"))
            Init.Start();
        return;
    }

public static void Start(){
    FB.Init(OnInitComplete, OnHideUnity);
}

private static void OnInitComplete()
{
    dMsg += "FB.Init completed: Is user logged in? " + FB.IsLoggedIn;
    if (!FB.IsLoggedIn) FB.Login();   //<--- Magic login code! :P
    isInit = true;
}

private static void OnHideUnity(bool isGameShown)
{
    dMsg += "Is game showing? " + isGameShown;
}