You'd be surprised / scared / outraged if you knew how common this is. Any time you've been in a public place for the past few years, you've likely been watched, analysed and optimised for. Advertising in the physical world is just as scummy as it's online equivalent. Check out the video here http://sightcorp.com/ for an ultra creepy overview. You can even try their live demo: https://face-api.sightcorp.com/demo_basi…
I tried variations of the standard expressions and pulled off sad, disgust, anger quite easily.
I knew binge watching Lie To Me before my psychology mid would come handy at some point!