title: Facebook app redirecting to different subdomains
body: <p>We're integrating facebook in our platform; we serve different customers and each one has a different access URL: <a href="http://customer1.example.com" rel="noreferrer">http://customer1.example.com</a>; <a href="http://customer2.example.com" rel="noreferrer">http://customer2.example.com</a> and so on. We're implementing OAuth 2.0 so customers are able to perform certain facebook actions from within the app.</p>
  
  <p>From the looks of the documentation (<a href="https://developers.facebook.com/docs/authentication/" rel="noreferrer">https://developers.facebook.com/docs/authentication/</a>), it seems that we'll need one facebook app per customer, to make the authorization flow work. Is there a way to specify a "wildcard" Site URL, let's say: http://*.example.com ?</p>