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A little while ago, someone used Facebook's last active time to track their friends' sleep: https://medium.com/life-tips/how-you-can-use-facebook-to-track-your-

• Johnny_Brahms 10y ago
  I remember a bunch of friends being upset about this. Apparently it's an outrage that your friends can do this, and perfectly fine that facebook probably does it all the time.
  • falcolas 10y ago
    The scope of behavior Facebook is capable of obtaining is probably beyond comprehension for most users. Having a slice of that scope opened up and dissected publicly is quite creepy; despite intellectually understanding how much data Facebook has about them, actually seeing that data in use creates a much more visceral reaction that simply intellect can not create.
  • lazzlazzlazz 10y ago
    Having somebody intentionally look into your life, individually, because of some possibly perverse or unwanted interest in you is extremely creepy. Having a large company store some data you generated in a server farm somewhere while a mindless algorithm does some math with that data to shuffle a few ads around for you to see is utterly banal and not creepy.
    • gertef 10y ago
      > Having a large company store some data you generated in a server farm somewhere ... and make it a available for somebody to intentionally look into your life, individually, because of some possibly perverse or unwanted interest in you