reCAPTCHA is a free, accessible CAPTCHA service that helps you block spam from your blog or website. It generates and grades tests that humans can pass but current computer programs cannot. A user who wants to register and/or comment on your site must first pass these tests. The newest version of reCAPTCHA is called No CAPTCHA reCAPTCHA, which simply requires a user to place a check on a box confirming that they are "not a robot" by verifying a specific type of image from a pop-up window.

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