Hmm, I just tried this with a few pictures, including one of mine. I forgot about all the "your selfies are being data-mined by the bad guys!" stories.
Ever heard of browser fingerprinting? If this site is doing it, now it has my IP, my browser fingerprint, and my face (as well as some friends' faces...). Search for my face on Facebook and they have my name too. Sell to marketer.
what can possibly go wrong ? or just paranoid ?