title: Using social authenticaion details to login from built in login system
body: <p>I have both the laravel built in and social authentication. Suppose if a user logs in using facebook, i store the user details such as <code>fb_id</code>, <code>username</code>, <code>email</code> etc. to the users table which is authenticable from built in login system.This way i can use laravel <code>Auth</code>. </p>
  
  <pre><code>$fb_user = Socialite::driver('facebook')-&gt;user(); 
  $user = User::firstOrCreate(['fb_id'=&gt;$fb_user-&gt;id,'name' =&gt; $fb_user-&gt;name, 'email' =&gt; $fb_user-&gt;email]);
  Auth::login($user, true);
  return redirect('/');
  </code></pre>
  
  <p>Now, the users table have a user with username and password NULL. Couldn't anybody login with just username from built in login if no password validations are required? OR what is wrong with my concept here?</p>