Are the Feds Stalking You on Facebook?
This may or may not be news to you, but Facebook is recording your location – specifically, wherever you are every time you log in to the service.
In fact, this is one of the bits of information the social network maintains in your complete Facebook log. (If you are a resident of the European Union, you can request a copy of that file. If you’re on this side of the pond, you’re out of luck, amigo.)