It’s surprisingly easy for anyone to buy ads that track location and app usage, study says

Researchers at the University of Washington have found a way to track a person’s location and app use through serving ads on mobile apps. The result opens the door for significant privacy invasions through the app-based advertising system.
The researchers obtained the information by purchasing a series of ads targeted to specific locations and apps, then checking which mobile subscribers fit the targeting. In experiments conducted on Android devices, the team was able to pinpoint a person&