Mobile ad technique allows stalkers to follow you around a city for less than $1000

This month, University of Washington researchers will present Exploring ADINT: Using Ad Targeting for Surveillance on aBudget - or - How Alice Can Buy Ads to Track Bob at the Workshop on Privacy in the Electronic Society in Dallas; the paper details a novel way that stalkers and other low-level criminals can accomplish state-grade surveillance on the cheap with targeted ad-purchases. (more")