Comment by motoford

In case anyone wants to do this now I found this after a quick search

# Block Facebook

127.0.0.1 www.facebook.com 127.0.0.1 facebook.com 127.0.0.1 static.ak.fbcdn.net 127.0.0.1 www.static.ak.fbcdn.net 127.0.0.1 login.facebook.com 127.0.0.1 www.login.facebook.com 127.0.0.1 fbcdn.net 127.0.0.1 www.fbcdn.net 127.0.0.1 fbcdn.com 127.0.0.1 www.fbcdn.com 127.0.0.1 static.ak.connect.facebook.com 127.0.0.1 www.static.ak.connect.facebook.com

Taken from http://cariblogger.com/2010/07/how-to-block-facebook-using-h...