title: Authorize web app to connect to previously connected third-party services
body: <p>Our dashboard web app incorporates API feeds from multiple third-party membership websites. When we're on-boarding a new user, we'd like to use FB Connect and OAuth to</p>
  
  <ol>
  <li>verify identity of user</li>
  <li>grant permission to our app to access FB graph data, and</li>
  <li>determine if the user has previously approved some of those third-party services we incorporate.</li>
  </ol>
  
  <p>We would like the user to be able to grant us permission to connect those services on behalf of the user as well, all in one OAuth session. Is this possible?</p>
  
  <p>I.e. if we provide FB with a list of our services that we connect to, can we get a yes/no from FB Connect as to whether the user has pre-approved those services elsewhere using FB Connect? Then, we would provide a secondary approval page to the user saying "looks like you've already logged in to these X, Y, and Z apps which we use in our dashboard. Would you like to grant us access to those apps as well and pull them in to your dashboard?"</p>