Best unobtrusive anti-spam technique (Not CAPTCHA) | Urbano's Blog - 0 views
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Frederik Van Zande on 25 Aug 08I know you are probably thinking that this will be some silly thing, but this idea that Thomas Landauer came up with is by far the best I've seen in a long time. Add CSS-hidden fields that a user won't see, but a spam-bot will fill. Then using php check if they were filled, and if they were: block the spammer!