A global spy tool exposed the locations of billions of people to anyone willing to pay. A Catholic group bought location data about gay dating app users in an effort to out gay priests. A location data broker sold lists of people who attended political protests. What do these privacy violations have in common? They share a source of data that’s shockingly pervasive and unregulated: the technology powering nearly every ad you see online. Each time you see a targeted ad, your personal information ...