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[Silverthorn]

There is a captcha during registration-process. Yet still, some manage to bypass it. I don't see how an extra-captcha should stop them.

How about a more modern Captcha? http://www.google.com/recaptcha/intro/index.html

I had used recaptcha for a while. Interestingly, it did not reduce the amount of bots. On the contrary, there were more of such registrations during that phase. That's why it's a different, more anciently looking captcha. It does its job, though