Using the location data company's leaked dataset, reporters identified a Secret Service agent, his home address, family details, and tracked Trump's movements (New York Times)

New York Times:
Using the location data company's leaked dataset, reporters identified a Secret Service agent, his home address, family details, and tracked Trump's movements  —  IF YOU OWN A MOBILE PHONE, its every move is logged and tracked by dozens of companies.  No one is beyond the reach of this constant digital surveillance.

via Techmeme