I believe Facebook's position on use of competing technologies in Facebook apps is relevant: http://news.ycombinator.com/item?id=2291336 http://news.ycombinator

I believe Facebook's position on use of competing technologies in Facebook apps is relevant: http://news.ycombinator.com/item?id=2291336 http://news.ycombinator.com/item?id=2291336 (Google Adsense banned from Apps) And less seriously: http://techcrunch.com/2011/07/15/google-ad-on-facebook-is-banned/ http://techcrunch.com/2011/07/15/google-ad-on-facebook-is-ba... (Google+ Ad banned)