My guess is that the effort of blacklisting them is going to cost you far more than the false positives will. Not to mention a less swift experience for your us

My guess is that the effort of blacklisting them is going to cost you far more than the false positives will. Not to mention a less swift experience for your users. Unless of course you are the admin for http://www.faceboo.com/ http://www.faceboo.com/