How will they tell the others? They are banned and can't use PMs.
I actually have my site set so that when you first register, you are in a usergroup that cannot use PMs. Then, you get promoted to a regular usergroup after at least a day. So, if my users get banned, they can create a new account, but not PM anyone. And, I could make that usergroup so all posts get moderated also, so they couldn't post about it.
Yeah, I like the idea of this mod.
What I meant was, after the first few days it would be all out in the open.