A response from Luis von Ahn of reCAPTCHA: "Some of our big customers have done A/B tests that show that using reCAPTCHA does not change conversion rates for them. In general, if you're being attacked by spam, using a CAPTCHA is a good idea, since spam DOES decrease usage of your site. On the other hand, for small sites that have no spam problem, using a CAPTCHA is probably not a good idea."
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