‘Your Apps Know Where You Were Last Night, and They’re Not Keeping It Secret’
https://www.nytimes.com/interactive/2018/12/10/business/location-data-privacy-apps.html
“At least 75 companies receive anonymous, precise location data from apps whose users enable location services to get local news and weather or other information, The Times found. Several of those businesses claim to track up to 200 million mobile devices in the United States”
Also on our forum: https://forum.ind.ie/t/your-apps-know-where-you-were-last-night-and-they-re-not-keeping-it-secret/2525