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Patrick Bergel
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Chirp founder here - AMA. Chirp can broadcast on any device that carries sound - radio, TV, mobile and now laptops.
Chirp
Like Bump, but uses sounds to share
Patrick Bergel
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Chirp Founder here. Google Tone is a somewhat inferior take on my app Chirp launched a while back, as previous posters have mentioned. Ask me anything!
Google Tone
Exchange URLs with nearby computers (using sound)