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Hundreds of apps put snoops to work and then there is "supersonic tone tracking". Of 300 apps Exodus has analysed, Yale says 75 per cent contain trackers.
https://www.theregister.co.uk/2017/11/28/android_apps_unexpectedly_track_users/
 74    9     Wednesday, November 29, 2017    # apps # spyware # trackers