@simon I don't really understand how Facebook has such a hard time knowing who is human and who is not, at least within the US.
If you've done anything requiring a credit check, you know that the credit agencies know every place you've lived, who lived there with you, etc.
How hard could it possibly be to ground their network of (presumably real-named) US accounts in that data and get definitive ground-truth on at least 50% of US accounts?
