Yep, I don't know what happened, but I suspect someone started up a new spam server or something. 95% of the accounts that have joined get deleted. The Poland (.pl) TLD is about to get a complete block with regards to email address signups.
Most of them sign up and put URLs linking to their crap websites in their profile and never do anything else. The other ones post threads that get put automatically into a moderated state that requires manual approval when they have URLs in their post. Most spammers do this, and they won't get through until after they have a certain number of posts that have been approved before letting posts with URLs in them. The crap still happens, you just see less of it now.
I'm looking through the log file which records the attempts of account registration and I can't believe how many attempts to create accounts are rejected.
2011-02-13 16:21:55 & 2011-02-14 11:26:44 there are 200 attempts to register accounts from spammers. The plug-in I'm using rejects them based on look-ups from multiple sources. Of the 200, 3-4 accounts got registered and one made a post that was automatically moderated due to the content. The other accounts register and put spam links in their profile.
They are persistent fucks.
Also, since I've implemented this, there are 17,197 total log entries (each log entry is an attempt to register an account). I started using this on 2010-11-07 09:08:16...
I wasn't posting in hopes for thanks (but thank you for saying them), I'm just overwhelmed sometimes with dealing with those dickheads. We're a small forum...how do other larger forums handle this crap?
I've added a lot more restrictions to the private messaging for members who have recently signed up and also members who are in a group designed to allow for limited behavior until they've vetted themselves as a real person. I hope this helps mitigate this problem.