Why not moderate first posts this combined with selective IP bannishment should reduce the spam quite a bit. Also using a hack to detect multiple accounts will help with your IP ban list. We still have accounts being created for bots with IPs that are not banned but the bots themselves rotate through a group of IPs that are banned when attempting to post the spam. It can be time consuming and take some effort but in less then a month we have reduced spam to a level that is managable by the site staff and we have not had a reduction in new user registrations.
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