Your Apps Know Where You Were Last Night, and They’re Not Keeping It Secret
Dozens of companies use smartphone locations to help advertisers and even hedge funds. They say it’s anonymous, but the data shows how personal it is.
The millions of dots on the map trace highways, side streets and bike trails — each one following the path of an anonymous cellphone user.
One path tracks someone from a home outside Newark to a nearby Planned Parenthood, remaining there for more than an hour. ...
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