title: Facebook login for an app with subdomains
body: <p>Since the "Use Strict Mode for Redirect URIs" became obligatory I have an issue with my application.
  It uses the</p>
  
  <blockquote>
    <p>user.myapp.com</p>
  </blockquote>
  
  <p>schema to allow different users to log inte their "work area".
  But while the list of the users is dynamic, I cannot modify the Client OAuth Settings every time a new user is added.</p>
  
  <p>Is there any solution to this problem?</p>