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There is no reason not to replace your older CAPTCHAs with this. CAPTCHAs are nasty things with terrible failure rates for legitimate users, even though they've been optimised to no end by security researchers. The first thing security engineers are told is not to serve CAPTCHAs when there's no reason to think a user is not legitimate. The face value of ...


We just incorporated it for security against fraud through our donation forms (at MobileCause), and it works very well. When a user IP is blocked because of potential fraud, instead of blocking the IP completely we require that the user go through reCaptcha to prove they're human. In testing it's worked very well. Testing it was kind of a pain though (we ...

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