I find it unbelievable that Facebook doesn't have the fake profile situation under control. Facebook builds an incredibly detailed social graph of every user (and non-user) with a big trail of activity, on and off Facebook. Surely there are signs; surely there are common characteristics, and if this journalist can write such a detailed exposé with only public data, Facebook can do much better.
Why would they scuttle their own engagement metrics by pruning out highly-engaged segments of the social network, though?
Facebook will only remove the accounts that give them too much (media) trouble.