Facebook Files For Patent Of Social CAPTCHAs

In its latest salvo in the fight against spam, Facebook has filed a patent application for a “social CAPTCHA” system.

CAPTCHAs, which ask people to re-enter a code displayed visually, have become well known as the main system for blocking spammers on the web. Facebook believes the social CAPTCHA will prevent spam even more effectively. The picture, right, is of Facebook’s current CAPTCHA system, not of a social CAPTCHA.