I mean, I knew that already, but holy cow. I installed the Stop Forum Spam plugin on my forum. Lets you report spammers, and automatically check if anyone else has reported spam when new users sign up. Checks email, IP and username.

This one is impressive:
http://www.stopforum...iyfga%40gmail.com

One email address, three reports: three different usernames, three IPs, coming from Japan, Philippines, and Russian Federation. Someone apparently travels a bit. Or ... maybe they aren't using their own machines to log in. Maybe.

It's amazing the patterns you see in the registrations. I'm almost starting to recognize IP ranges from Eastern Europe.