composer require laravel/socialite ~2.0
composer update laravel/socialite

"require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "laravel/socialite": "~2.0"
    },

<a href="{{ url('/redirect') }}">Login with Facebook</a>

Route::get('/redirect', 'SocialAuthController@redirect');
Route::get('/callback', 'SocialAuthController@callback');

'facebook' => [
  'client_id' => 'app-id',
  'client_secret' => 'app-secret',
  'redirect' => 'http://example.dev/callback',
],

<?php

namespace AppHttpControllers;
use IlluminateHttpRequest;
use AppHttpRequests;

use Socialite;

class SocialAuthController extends Controller
{
  public function redirect()
  {
    return Socialite::driver('facebook')->redirect();
  }

  public function callback()
  {
    $user = Socialite::driver('facebook')->user();
    dd($user);
  }
}