I'm not sure why they call it "private data" when it can be used against you in court. 
All that data, even the allegedly 'private' social media data, is not private but is fair game as e-discovery in civil litigation. Another study found who you are digitally on Facebook is who you are offline in real life. Lastly, the more data we overshare on social media, the more it becomes the "norm" for society . . . meaning for society as a whole, it lowers what is considered a reasonable expectation of privacy.
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