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I've been using the reCaptcha (now Google) spam prevention system (it requires users to type in letters from an image to verify that they're human and not a spam bot) for some time now, and for the most part, it would catch at least 80% of the spam coming through.
I don't know if spammers have gotten more intelligent or if the reCaptcha system is outdated, but it hardly appears to be catching (preventing) any spam comments anymore! Does anyone know of a better alternative to ReCaptcha?
There's many reCaptcha alternatives out there. The most successful one we're aware of is called Mollom. It currently protects over 30,000 websites with an average efficiency rate of 99.93% - which means that only 7 in 10,000 spam messages are not routinely caught by Mollom's filters.
Another advanced anti-spam captcha, but one that is reportedly harder to answer correctly, is the Egglue CAPTCHA - a semantic captcha that tests a users basic intuition.
Anonymous
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