Facebook cannot communicate with Symfony app due to sfGuardAuth authentication required
===

I'm building a music website on Symfony 1.4 and Doctrine 1.2.  I'm trying to integrate facebook plugins (like, send, post a message buttons) on my pages.  For example, I want users to be able to like a song on a song page in my song module.  But the problem is, I've used sfDoctrineGuard to secure all modules on my app except for the landing page.  So if a user logs in and uses the facebook like button to like a song on the song page, because that song module is secured by sfGuardAuth, facebook API can't talk to it and gets forwarded to the landing page.  This means that all likes on my app get posted on facebook activity feed as if the user liked my landing page.

Is there a way to build an exception into sfGuard so that any traffic coming from facebook domain can access that page?   Is there a workaround to this?  I want to be able to show all the facebook meta data from my secured pages, for whichever song is liked, on a facebook wall.  If I disable all sfGuard security, it works fine.

Any help would be great as I'm stumped and haven't found any one else with this problem.  Thanks.