You better watch out You better not cry Better not pout I'm telling you why Big Data is coming to town It knows when you are sleeping [0] It knows

You better watch out You better not cry Better not pout I'm telling you why Big Data is coming to town It knows when you are sleeping [0] It knows when you're awake It knows if you've been bad or good So be good for goodness sake. 0: https://medium.com/@sqrendk/how-you-can-use-facebook-to-track-your-friends-sleeping-habits-505ace7fffb6 https://medium.com/@sqrendk/how-you-can-use-facebook-to-trac...