Opinion | How to Track President Trump – The New York Times

January 16, 2020

https://www.nytimes.com/interactive/2019/12/20/opinion/location-data-national-security.html QT:{{”
“With no training and far more limited technical tools than those of a state intelligence service, we were able to use the location data — date, time and length of stay — to make basic inferences. By determining whether two people were in the same place at the same time, it was easy to zero in on spouses, co-workers or friends. Cataloguing their movements revealed even more associations, creating the map of a robust social network that would be nearly impossible to determine through traditional surveillance. In cases where it was difficult to identify an individual, associations offered more clues about workplaces and interests.”