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Luis von Ahn, who invented the ubiquitous CAPTCHA system to prevent spammers from filling out Internet forms, talks to Wired Science about his research and other CAPTCHA related games he created to help people solve complex CAPTCHA images while still having fun. Thanks SEJ.
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I don’t think captcha has really helped way too much in cutting down the spam … especially in chat rooms it have nt worked..
may be in the blogs… and social networking sites it might have.. made a lil difference ….
But cause of captcha the REAL user suffers..