Monetization in FB
http://techcrunch.com/2012/07/03/little-want-button-code-forshadows-big-things-for-facebook-ecommerce/
first thing I thought when I read about it was 'wedding lists' - absolutely perfect way to monetize.
I'm meant to be writing an insightful blog post about where FB will be trying to earn its cash at some point - so feel free to add insight everyone :)
collectibles too. the want button (and the data gathered from it) definitely would have more commercial value than a generic 'like'.