title: Creating facebook app with callback url
body: <p>I am creating a facebook app. And I want to let users to login to my website using it(Using passportjs).</p>
  
  <p>But to do that, I need to give callback url(my website url). But I couldn't find that field in the facebook app creating page.</p>
  
  <p>Am I missing something? I have searched for it for a quite long time.</p>