The latest Guardian revelations from the Snowden documents make interesting reading. They detail the labyrithine methods by which the security services track people via mobiles, social media, downloads, Angry Birds etc etc.
I was particularly fascinated by this passage:
GCHQ’s targeted tools against individual smartphones are named after characters in the TV series The Smurfs. An ability to make the phone’s microphone ‘hot’, to listen in to conversations, is named “Nosey Smurf”. High-precision geolocation is called “Tracker Smurf”, power management – an ability to stealthily activate an a phone that is apparently turned off – is “Dreamy Smurf”, while the spyware’s self-hiding capabilities are codenamed “Paranoid Smurf”.