Today I Learned (TIL)

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TIL about Ultrasonic cross-device tracking. Audio "beacons" can be embedded into television advertisements. In a similar manner to radio beacons, these can be picked up by smartphones, which allow... (en.wikipedia.org)

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The original was posted on /r/todayilearned by /u/aquilaPUR on 2025-06-17 21:34:37+00:00.

Original Title: TIL about Ultrasonic cross-device tracking. Audio "beacons" can be embedded into television advertisements. In a similar manner to radio beacons, these can be picked up by smartphones, which allows the behavior of users to be tracked. Humans can't hear these sounds at all.

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