Tech companies are able to construct virtual perimeters (geofences) and, using cell phone location data supplied by apps, radio-frequency tags or wi-fi networks, identify everyone who enters, exits, or is located within that perimeter. That aggregated information is sold to marketing firms to push information, real time or subsequently, to those who are in (or had been in) a given location. Political groups are increasingly interested in the same information, and the current protests are proving a boon to liberal advocacy groups and voter-registration groups, which one user called “deeply spooky yet extremely helpful" in a recent Wall Street Journal article. However, the use of this "harvested" geofencing data raises important issues about privacy, surveillance, and informed consent. For more, see www.wsj.com/articles/how-political-groups-are-harvesting-data-from-protesters-11592156142
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