This is also known as a "hellban" http://www.urbandictionary.com/define.php?term=hellban http://www.urbandictionary.com/define.php?term=hellban I think it's a

This is also known as a "hellban" http://www.urbandictionary.com/define.php?term=hellban http://www.urbandictionary.com/define.php?term=hellban I think it's a deliciously evil solution to spammers and trolls, as you've described.