If bots are your problem, just go into ACP > vBulletin Options > Human Verification Manager > Add new question >
Question: (Simple mathematical equation) 1+1 equals to?
Answer: 2
Answer: two
Keeps ALL bots away. Since the start of my vBulletin board, I had 0 spammers registered even if they do visit my site.
On another note, if you want to keep your users moderated, the above posts are true =p
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