I am creating a Facebook iFrame tab application that features weekly interviews and uses a CMS to manage the interview content. I would like to be able to post a link to my newsfeed that points to the application tab and will show a preview with metadata in the newsfeed. Currently, there is no metadata showing up and it is just a blank link. How can I get Facebook to show a preview of the link to the application tab, the same as it would show a preview of a link to any website when posting to my newsfeed?
Facebook doesn't read metadata from your iframed tab, but you can set up a redirect page with custom Open Graph meta tags as described in the Facebook Developers Forum here: http://forum.developers.facebook.net/viewtopic.php?id=96146
UPDATE 2012.05.20: forum.developers.facebook.net has been replaced by facebook.stackoverflow.com. The link I provided no longer works, but there are some helpful related threads on the new forum: