One leaked file, the location of 12 million smartphones

A file leaked to The New York Times contained location traces of 12 million unique smartphones. Stuart A. Thompson and Charlie Warzel went digging:

The data set is large enough that it surely points to scandal and crime but our purpose wasn’t to dig up dirt. We wanted to document the risk of underregulated surveillance.

Watching dots move across a map sometimes revealed hints of faltering marriages, evidence of drug addiction, records of visits to psychological facilities.

Connecting a sanitized ping to an actual human in time and place could feel like reading someone else’s diary.

They also probably found the POTUS in the data.