i was wondering why facebook and google acquired eye tracking companies. http://www.zdnet.com/article/facebook-acquires-eye-tracking-startup-gazehawk/ http://w

i was wondering why facebook and google acquired eye tracking companies. http://www.zdnet.com/article/facebook-acquires-eye-tracking-startup-gazehawk/ http://www.zdnet.com/article/facebook-acquires-eye-tracking-... https://techcrunch.com/2016/10/24/google-buys-eyefluence-eye-tracking-startup/ https://techcrunch.com/2016/10/24/google-buys-eyefluence-eye...