Probably you’ve heard about the NSA surveillance program PRISM, XKeyscore and the GCHQ’s Tempora. If you did not, you should start looking up for information, because we have bad news, you are being tracked down.
Basically, these are clandestine-mass-electronic-top-secret-data-mining programs, operated by the National Security Agency and other governments agencies such as the Britsh Government Communications Headquarters.