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A comment on “Ultrasonic cross-device tracking” embeds inaudible tones in advertisements. Parent comment

Re:“Ultrasonic cross-device tracking” embeds inaudible tones... by vaishaksuresh on Friday November 04, 2016 @03:40PM (#12875381)
Your example is not completely relevant. Facebook has been known to track people who are not actually Facebook users, meaning they never opted in.
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