The New York Times takes a closer look at the data that apps collect and what they know about you:
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 — about half those in use last year. The database reviewed by The Times — a sample of information gathered in 2017 and held by one company — reveals people’s travels in startling detail, accurate to within a few yards and in some cases updated more than 14,000 times a day.
The animated visuals in this piece are nice, strengthening the big numbers with small anecdotes. Because the only way to make people care about data privacy is to be as creepy (but responsible) as possible.