Quote" ... He is one of the key people who drove Facebook’s growth from 30 million users in 2005 to 550 million users in 2011 (the year he left)."<p>He was present, but how can anyone meaningfully claim that he "drove" or was in any way responsible for the increase in users? Facebook now has over a billion users, half of whom signed up since this person left Facebook.<p>I mention this only because too many claims like this are made based on zero evidence of a cause-effect relationship.