just brew it! wrote:I realize the OP is a few months old, but this is relevant: https://en.wikipedia.org/wiki/Device_fingerprint
Bottom line is, if you've *ever* been logged in from a particular device, there are methods for Google, Facebook, etc. to make a reasonably good guess at when you use that device again, even if you don't log in.
just brew it! wrote:Yeah, none of this is terribly surprising. But as someone who grew up in the pre-internet age, sometimes I take a step back, look at where we are today, and think to myself, "Holy crap, Skynet is coming... but not because of a military project run amok; it'll be because people can't resist easy-to-use tools to share pictures and video of their self/kids/dog/cat/car/dinner, and/or access to free porn!"