People make way too much of the Facebook platform. The part that's relevant to innovation is allowing third-party apps access to a list of who and what a user likes. It's silly that people are obsessed with building those apps inside Facebook, though. Look at use rates for the various apps. Facebook could get rid of every app except the basic profile, Photos, messages, the Wall, and Events, and it would be just as popular. The rest isn't nearly as promising.