Facebook patent for 'social CAPTCHA' fails on accessibility
A CAPTCHA is a challenge-response test that was originally created to ensure that the response given was from a human rather than from a computer. A common type of CAPTCHA requires that the user type letters or digits from a distorted image that appears on the screen. There are accessible alternatives to CAPTCHAs for people who are blind or vision impaired, such as audible CAPTCHA or a new CAPTCHA solution that asks you to slide an icon across the screen with either the mouse or keyboard
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