Did you know that you’ve been tagged like a whale, with a radio collar? Odds are you carry a cell phone, and that it’s on most of the time you have it. Your cell company, and possibly your government can thus create one of these interesting and creepy interactive maps, telling them the story of your life. Foursquare is a footnote compared to this map. Imagine it in the wrong hands?
If you don’t care about data privacy, why not? Fortunately there is the Green Party, the Pirate Party, the EFF, and others working on limiting the damage this sort of invasive information can have on your life.