I have a Facebook account with zero friends on it. I used it to "own" an API key for an app I built for a freelance client. The "People You May Know" screen o

I have a Facebook account with zero friends on it. I used it to "own" an API key for an app I built for a freelance client. The "People You May Know" screen on that Facebook account has plenty of people I do in fact know. I imagine through people uploading their address books and then Facebook mining shared connections, they inferred a bunch of my network without me doing anything at all.