ANTM/Assets/Scripts/Managers/FacebookManager.cs

using System.Collections.Generic;
using UnityEngine;
using Facebook.Unity;

public class FacebookManager : MonoBehaviour
{
    public bool LoggedIn;
    public static FacebookManager Instance;

    public delegate void LoginCall(bool success);
    public static event LoginCall OnLoginCall;

    public string UserID;
    public string FirstName;
    public string LastName;

    private void Awake()
    {
        Debug.LogError("FacebookManager");

        if (!Instance)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
        }
    }

    public void InitFB()
    {
        FB.Init(OnInit);
    }

    void OnInit()
    {
        if (FB.IsLoggedIn)
        {
            FB.API("/me?fields=id,first_name,last_name", HttpMethod.GET, GetUserInfo);
        }

        LoggedIn = FB.IsLoggedIn;

        if (OnLoginCall != null)
        {
            OnLoginCall(LoggedIn);
        }
    }

    public void FBLogin()
    {
        FB.LogInWithReadPermissions(new List<string>() { "public_profile", "email", "user_friends" }, AuthCallback);
    }

    void AuthCallback(IResult result)
    {
        if (result.Error == null)
        {
            if (FB.IsLoggedIn)
            {
                Debug.Log("FB Logged in");

                FB.API("/me?fields=id,first_name,last_name", HttpMethod.GET, GetUserInfo);
                //FB.API("/me/picture?width=512&height=512", HttpMethod.GET, GetUserProfilePicture);
            }
            else
            {
                Debug.Log("FB Login failed");
            }
        }
        else
        {
            Debug.Log(result.Error);
        }

        LoggedIn = FB.IsLoggedIn;

        if (OnLoginCall != null)
        {
            OnLoginCall(LoggedIn);
        }
    }

    void GetUserInfo(IResult result)
    {
        if (result.Error == null)
        {
            UserID = result.ResultDictionary["id"].ToString();
            FirstName = result.ResultDictionary["first_name"].ToString();
            LastName = result.ResultDictionary["last_name"].ToString();

            Debug.Log("FaceBook Got User Data = " + FirstName + " " + LastName);
        }
        else
        {
            Debug.Log(result.Error);
        }
    }
}