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unzombied [soylentnews.org] writes:

Synchronizing email, texts, calendar, bookmarks, contacts, notes, git? Done. ArsTechnica (UK) has an article about synchronizing consumer and friend's device use without consumer involvement [arstechnica.co.uk]? TV playing at a pub, waiting room, client's location?

The ultrasonic pitches are embedded into TV commercials or are played when a user encounters an ad displayed in a computer browser. While the sound can't be heard by the human ear, nearby tablets and smartphones can detect it. When they do, browser cookies can now pair a single user to multiple devices and keep track of what TV commercials the person sees, how long the person watches the ads, and whether the person acts on the ads by doing a Web search or buying a product.

According to TechCrunch, Silverpush says it "isn’t receiving any actual audio data [techcrunch.com]" from some 18 million smartphones.

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