"When a smartphone user opens Angry Birds, the popular game application, and starts slinging birds at chortling green pigs, spies could be lurking in the background to snatch data revealing the player’s location, age, sex and other personal information, according to secret British intelligence documents.
In their globe-spanning surveillance for terrorism suspects and other targets, the National Security Agency and its British counterpart have been trying to exploit a basic byproduct of modern telecommunications: With each new generation of mobile phone technology, ever greater amounts of personal data pour onto networks where spies can pick it up."