Facebook.php

<?php
namespace App\SocialMedia;

class Facebook{
	protected $client_id;
	private $client_secret;
	public $redirect_url;

	public function __construct($facebook){
		$this->client_id = $facebook['client_id'];
		$this->client_secret = $facebook['client_secret'];
		$this->redirect_url = $facebook['redirect'];
	}
	public function getClientID(){
		return $this->client_id;

	}

	public function getClientSecret(){
		return $this->client_secret;
	}

	public function getRedirectURL(){
		return $this->redirect_url;
	}
}

FacebookServiceProvider.php

<?php
namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\SocialMedia\Facebook;
class FacebookServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind("App\SocialMedia\Facebook", function(){
           return new Facebook(config('services.facebook'));
        });

       $this->app->make("App\SocialMedia\Facebook");
    }
}

PostController.php

<?php
namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Post;
use App\User;
use Illuminate\Http\Request;
use DB;
use Auth;
use Facebook;
class PostController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(Facebook $fb){
      
      dd($fb);
    }
}