Not the site's... mine. And I'm introducing it unilaterally. Basically if you have a signature with links or open tags or whatever, and it's screwing with the rest of the thread (ie making everything below your post a link), I'm just going to delete the posts that cause it. It's really annoying and messes with the quote button.
So basically, if your sig's messed up, fix it, or all your posts will be deleted.