[im] location tracking

[János Sugár]

In an extraordinary piece of journalism, the Times shows just how 
easy it is to positively identify people in the data-set and then 
follow them: whether that's senior political officials, celebrities, 
protesters, cops, or the families and friends of all of the above. 
The writers describe how they were able to identify overnight 
visitors to the Playboy mansion, follow journalists as they talked 
with sources, and watch who came and went from massage parlors, 
methadone clinics, the White House, and more. They followed a tech 
exec as he left his employer's campus and interviewed for a job at 
its major rival, and tracked the children of police officers as they 
went to school and to friends' houses.
https://www.nytimes.com/interactive/2019/12/19/opinion/location-tracking-cell-phone.html