We used to have a lot of problem with spammers and spambots on the site I own. Simple addition of a captcha type filter, and a simple rule that anyone posting links has to wait 25 CONSTRUCTIVE posts before being allowed to, at the risk of getting booted if they repeatedly try to bypass this, got rid of 99% of the problem.
We still get the occasional one who tries to get clever, but its as quick to delete a membership as it is to post spam.
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