composer create-project --prefer-dist laravel/laravel user

php artisan make:auth

php artisan migrate

To get started with Socialite, use Composer to add the package to your project's dependencies:

composer require laravel/socialite

Configuration

After installing the Socialite library, register the Laravel\Socialite\SocialiteServiceProvider in your config/app.php configuration file:

'providers' => [
    // Other service providers...

    Laravel\Socialite\SocialiteServiceProvider::class,
],

Also, add the Socialite facade to the aliases array in your app configuration file:

'Socialite' => Laravel\Socialite\Facades\Socialite::class,

You will also need to add credentials for the OAuth services your application utilizes. These credentials should be placed in your config/services.php configuration file, and should use the key facebook, twitter, linkedin, google, github or bitbucket, depending on the providers your application requires. For example:

'github' => [
    'client_id' => 'your-github-app-id',
    'client_secret' => 'your-github-app-secret',
    'redirect' => 'http://your-callback-url',
],

Basic Usage

Next, you are ready to authenticate users! You will need two routes: one for redirecting the user to the OAuth provider, and another for receiving the callback from the provider after authentication. We will access Socialite using the Socialite facade:

<?php

namespace App\Http\Controllers\Auth;

use Socialite;

class LoginController extends Controller
{
    /**
     * Redirect the user to the GitHub authentication page.
     *
     * @return Response
     */
    public function redirectToProvider()
    {
        return Socialite::driver('github')->redirect();
    }

    /**
     * Obtain the user information from GitHub.
     *
     * @return Response
     */
    public function handleProviderCallback()
    {
		$github = Socialite::driver('github')->user();

        $user = User::whereEmail($github->getEmail())->first();    

        if (!$user) {
            $user = User::create([
                'email' => $github->getEmail(),
                'name' => $github->getName(),
                'password' => '<no_pass>',
            ]);
        }

        auth()->login($user);

        return redirect()->to('/home');
    }
}

Of course, you will need to define routes to your controller methods:

Route::get('login/github', 'Auth\LoginController@redirectToProvider')->name('github');
Route::get('login/github/callback', 'Auth\LoginController@handleProviderCallback');

Mejor opción:

https://blog.damirmiladinov.com/laravel/laravel-5.2-socialite-facebook-login.html#.WQgGnFPytE5

Official Documentation

In addition to typical, form based authentication, Laravel also provides a simple, convenient way to authenticate with OAuth providers using Laravel Socialite. Socialite currently supports authentication with Facebook, Twitter, LinkedIn, Google, GitHub and Bitbucket.