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Getting thousands of registration spam

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. ...
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40 views

Generating a URL with no content for captcha

I modified my regular form to ajax form. I have captcha simple_php_captcha in my form which is generating captcha. I need to chage it's image if the user request it to change. I am thinking to ...