Facebook can totally profit from this (and any similar sites) - this idea seems very innovative, thanks for sharing!
NewScientist recently published Captcha adverts capture your attention, about ads that require visitors to enter CAPTCHA codes to continue.
This specific article is about NuCaptcha, but this seems like an idea which would be pretty simple to implement.
What do you think? What sort of web sites and advertisements would be a good match for this type of system?
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