Ahh, odd. Usually the threads get locked or buried or something. Odd. You'd think people would have better things to do than to make accounts and bump old threads lol.
It's actually being a pretty huge issue around here. It's a company (or companies) paying spammers to go on sites like this to do this kind of crap. Badly, I might add.
As far as Kao has mentioned, the majority of them seem to be coming from Indian IP addresses.