Just read a blog post by Coding Horror explaining some types of banning (i never heard of them)… One i particularly like is Hellbanning:
A hellbanned user is invisible to all other users, but crucially, not himself. From their perspective, they are participating normally in the community but nobody ever responds to them. They can no longer disrupt the community because they are effectively a ghost. It’s a clever way of enforcing the “don’t feed the troll” rule in the community. When nothing they post ever gets a response, a hellbanned user is likely to get bored or frustrated and leave. I believe it, too; if I learned anything from reading The Great Brain as a child, it’s that the silent treatment is the cruelest punishment of them all.
I’ve always associated hellbanning with the Something Awful Forums. Per this amazing MetaFilter discussion, it turns out the roots of hellbanning go much deeper – all the way back to an early Telnet BBS system called Citadel, where the “problem user bit” was introduced around 1986. Like so many other things in social software, it keeps getting reinvented over and over again by clueless software developers who believe they’re the first programmer smart enough to figure out how people work. It’s supported in most popular forum and blog software, as documented in the Drupal Cave module.
(There is one additional form of hellbanning that I feel compelled to mention because it is particularly cruel – when hellbanned users can see only themselves and other hellbanned users. Brrr. I’m pretty sure Dante wrote a chapter about that, somewhere.)
You can read the rest of the article at Coding Horror