Anyone can buy online ads and track your location in real time

Online advertising has been accused of meddling in the 2016 presidential election, maliciously sowing fears about immigrants, and enabling potential ad buyers to single out antisemites. It turns out, however, that the creepiness inherent in an ad targeting system capable of tracking digital movements on an individual level is just getting started.
In a recently published paper, researchers at the University of Washington demonstrate that practically anyone can spend a little cash and track, in r