Based on the explanation that you provided here, it sounds like you missed the deadline to migrate your App Profile Page. As of 2pm today, the via link should follow this logic: 1. Canvas (if you have specified a Canvas URL for your app) 2. Page (if you have associated a Page with their app). Since they missed the deadline to migrate their existing App Profile Page, they will have to create this new Page in the Dev App (under Advanced settings). 3. Website (if they have a Website URL) 4. Facebook Homepage (if none of the above has been specified)

When and how are you trying to read the attachment?

Yes, you can add the og:image tag (developers.facebook.com/docs/opengraph). If you think this answer is acceptable, please vote up. :)