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The Age of Surveillance Capitalism: The Fight for a Human Future at the New Frontier of Power Highlight

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the ad tracker FidZup developed “communication between a sonic emitter and a mobile phone.…” It can detect the presence of mobile phones and therefore their owners by diffusing a tone, inaudible to the human ear, inside a building:

— Shoshana Zuboff

Replicated under Fair Use from The Age of Surveillance Capitalism: The Fight for a Human Future at the New Frontier of Power by Shoshana Zuboff. (Pg. 137)