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An Anonymous Coward sent us a link to, and a copy of, a Google Research blog post about a new experimental Chrome extension, Tone, that "broadcasts the URL of the current tab to any machine within earshot that also has the extension installed."

As digital devices have multiplied, so has the complexity of coordinating them and moving stuff between them. Tone grew out of the idea that while digital communication methods like email and chat have made it infinitely easier, cheaper, and faster to share things with people across the globe, they've actually made it more complicated to share things with the people standing right next to you. Tone aims to make sharing digital things with nearby people as easy as talking to them.

[…] Tone provides an easy-to-understand broadcast mechanism that behaves like the human voice — it doesn't pass through walls like radio or require pairing or addressing. … Because it's audio based, Tone behaves like speech in interesting ways. The orientation of laptops relative to each other, the acoustic characteristics of the space, the particular speaker volume and mic sensitivity, and even where you're standing will all affect Tone's reliability. Not every nearby machine will always receive every broadcast, just like not everyone will always hear every word someone says. But resending is painless and debugging generally just requires raising the volume.

[…] To get started, first install the Tone extension for Chrome. Then simply open a tab with the URL you want to share, make sure your volume is on, and press the Tone button. Your machine will then emit a short sequence of beeps. Nearby machines receive a clickable notification that will open the same tab. Getting everyone on the same page has never been so easy!"