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Please Don’t Make Me Download Another App | Our phones are being overrun
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
I was thinking about that a while back. There's got to be some sort of upper limit to collecting data being useful. I mean at some point it becomes more economical to just buy the data from one other thousands of companies data mining phones rather then going to all the trouble of building and maintaining your own data mining app.
They just sell the data. If they need user data (beyond basics) they might buy it from a data mining company.