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Now, I get zero spam per day with ReCAPTCHA
reCAPTCHA is a system developed at Carnegie Mellon University that uses CAPTCHA to help digitize the text of books while protecting websites from bots attempting to access restricted areas.reCAPTCHA is currently digitizing text from the Internet Archive and the archives of the New York Times.

reCAPTCHA supplies subscribing websites with images of words that optical character recognition (OCR) software has been unable to read. The subscribing websites (whose purposes are generally unrelated to the book digitization project) present these images for humans to decipher as CAPTCHA words, as part of their normal validation procedures. They then return the results to the reCAPTCHA service, which sends the results to the digitization projects. This provides about the equivalent of 160 books per day, or 12,000 manhours per day of free labor (as of September 2008).

reCAPTCHA is free
Anti-Bot Service that helps digitize books
Strong security
Accessible to blind users
30+ million served daily

The system is reported to deliver 30 million images every day (as of December 2007), and counts such popular sites as Facebook, TicketMaster, Twitter and StumbleUpon amongst subscribers.Craigslist began using reCAPTCHA in June 2008.The U.S. National Telecommunications and Information Administration also uses reCAPTCHA for its digital TV converter box coupon program website as part of the US DTV transition.

via: recaptcha | wikipedia | Get recaptcha | Wordpress Plugin

Technorati Tags: ReCAPTCHA, wikipedia, plugin, anti-spam, spam protection, wordpress, plugin, Facebook, TicketMaster, Twitter, free

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