Facebook bought an eye-tracking startup a few years back: http://www.businessinsider.com/facebook-acquires-gazehawk-for-talent-2012-3 http://www.businessinsider

Facebook bought an eye-tracking startup a few years back: http://www.businessinsider.com/facebook-acquires-gazehawk-for-talent-2012-3 http://www.businessinsider.com/facebook-acquires-gazehawk-fo... At the time, i read it was only a acquihire