Is there some kind of security breach or have they found a new way to automate the registering process for vBulletins?
I’ve reported alot of spam posts already, but due to the 60 second posting interval, you can’t keep up 
It’s all about in-game money for MMORPG’s too (World of Warcraft, Runescape etc)
It’ll be automated, they’ve just managed to do it for this version of vbulletin.
Vlado - i’d reccomend getting one of the ‘type in the numbers in the image to login’ things, there are loads of pre-made ones around that your admin can customise slightly and it’ll stop all this without you needing to close any forums.
Captcha
That would be a Captcha
This is actually ON right now (e.g. registering requires both image verification and email address verification). There is still spam…
Best regards,
Vlado