http://adage.com/article/the-media-guy/zuckerberg-dismiss-law-diminishing-returns/235415/
What Took Us All So Long to Figure Out the Fatal Flaw in Zuckerberg's Law?
You Know, There Are Actually Limits to Human Attention Spans
Zuckerberg, of course, has done much to make sure his pronouncement would come true -- effectively forcing users to share more and more by tweaking the Facebook interface and its privacy policies, as well as by signing deals with the likes of Spotify so that Facebook-user activities would be automatically shared.
But it turns out that there's a law that trumps Zuckerberg's Law: the Law of Diminishing Returns.