vbulletin can be mod'd to not let new users send PM (or post URLs ...) might be a too much effort or not desirable here but it helps the drive by spam on the tech forum I mod.
"I have heard there are troubles of more than one kind. Some come from ahead and some come from behind. But I've bought a big bat. I'm all ready you see. Now my troubles are going to have troubles with me!" - Dr. Seuss