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)."

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.

I mention this only because too many claims like this are made based on zero evidence of a cause-effect relationship.