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We have tried the range of Captcha options, and now have Facebook Connect with Akismet installed as a constant, but still can't stop thousands of spam registrations from attacking our WordPress site. There must be a solution. Can anyone help?

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You should read into this article. – kaiser Nov 22 '12 at 13:27

I use the SI CAPTCHA Anti-Spam Plugin in combination with protecting the Site with Cloudflare. Got rid of 99,9% of the Registrationspam, from over a thousand a day to 1-2 a day.

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