Most sites, when signing you up or verifying who you are after suspicious activity, ask you to answer a security question, or possibly read two out-of-focus words and type them into a box. Facebook is testing out a "social captcha", where pictures of friends of the user trying to log in are shown, and the would-be user is asked to identify them. It's only being used on a limited basis for now (though one Lifehacker editor encountered it last year, but it's a good reason to think about stripping down your Facebook to actual friends for the future. [Facebook Blog]
Facebook Experimenting With 'Social Captchas' For Authentication
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