They're exploiting beacons for free location info. "The use of Bluetooth is especially notable because it can capture data and target people with political mes

They're exploiting beacons for free location info. "The use of Bluetooth is especially notable because it can capture data and target people with political messages as they travel through a physical space. This practice has jumped to politics from the advertising industry. In one recent example, Bluetooth beacons (the radio transmitters used to track cell-phone users via Bluetooth signals) were found in campaign yard signs [https://mashable.com/article/beacons-location-tracking-republican-campaign/ https://mashable.com/article/beacons-location-tracking-repub...]. In another, people were surveilled using these practices when they went to church. Our team has been exploring how this phenomenon—which we term geo-propaganda—has increased."