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A comment on TV is watching you – Companies inventing new ways to make money off your data. Parent comment
Also, there are ultrasonic beacons and other such signals at any reasonably busy public place and in many places you wouldn't expect. https://en.wikipedia.org/wiki/Cross-device_tracking
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Also, there are ultrasonic beacons and other such signals at any reasonably busy public place and in many places you wouldn't expect. https://en.wikipedia.org/wiki/Cross-device_tracking