A smaller (but equally fruity) version:
Some member keeps on spamming the crap out of user notes...WHAT DO YOU DO :o
BANHAMMER.
Send them a message to keep all advertising to signatures, even for the actual site.
I am sorry. The correct answer is to destroy the abomination known as usernotes =D
I think it's something to think about though. Usernotes is just a place where people spam now, maybe we should get rid of them? Or do you think that'll destroy some of the fun at eoff?