Facebook should sponsor and create content viewing events that are only visable via facebook.
What if there was a "real world FB" where FB users live together and drama ensues - and the only way to watch it is FB.com.
There are so many other things that FB could do to truly be a platform: Education via FB, Work via FB (think having a mechanical turk via FB where users could sign up to be a part of the service and use the FB platform to earn money), videoconference within FB, etc etc etc.