As far as fake profiles and "growth hacking" go, I bet FB has solved for the optimal per cent of fake profiles. Above this amount, FB brand suffers, below this

As far as fake profiles and "growth hacking" go, I bet FB has solved for the optimal per cent of fake profiles. Above this amount, FB brand suffers, below this level ad revenues suffer. They probably also factor in the cost of effectively keeping fake profile below this threshold. That's not to say FB encourages or promote fake profiles, I just think they've studied it a lot more intensely than most of us commenters have. And given their size, few have a greater economic incentive than them to fully understand the problem.