title: How to make/use face detection for logging in to website?
body: <p>I want to build a website (just for example, imagine Facebook) where login happens through face detection and matching (the same you see in some laptops and computers nowadays for logging) rather than inserting email id and password. And the same face detection to be used as search feature. If I face the camera towards another person, it will run the face detection, match whatever the values in database are, and returns the found/matched user. So there is any API for that? Do you know any algorithm for it? Please mention as elaborate as possible.</p>
  
  <p>I code in Ruby and Ruby on Rails, and I just want to make this as I want to experiment. I love face detection and matching feature.</p>