Sidenote....
Quick and dirty way to block those pesky bot spammers (they have defeated the captcha/image verification during registration) is to add a required field to profiles/registration like "choose a number between 1 and 100" (use the regex option to make sure it IS a number between 1 and 100 .. or whatever you come up with) ...
I did this on our board and stopped them dead in their tracks. If it was ever circumvented, I'd just change that required field to another question.
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