Apparently it was also mentioned in The Facebook Effect http://www.allfacebook.com/facebook-knows-that-your-relationship-will-end-in-a-week-2010-05 http://www.

Apparently it was also mentioned in The Facebook Effect http://www.allfacebook.com/facebook-knows-that-your-relationship-will-end-in-a-week-2010-05 http://www.allfacebook.com/facebook-knows-that-your-relation... "Zuckerberg sometimes amused himself by conducting experiments ... he studied who was looking which profiles, who your friends were friends with, and who was newly single, among other indicators..."