NSA Using Advert Cookies and Smart Phone Apps to Track Users

The same documents also appear to show the NSA as using data gathered from smartphone apps, under another section apparently named "Happyfoot." The location data stemming from a smartphone app is considerably more useful for the security agencies, due to the higher positional accuracy when compared to far broader cellular mast-based tracking, potentially allowing for agencies to track the movements of suspects without the need for any intrusive techniques.

Yeah. This stuff gets better and better