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Jack Dorsey just released a Bluetooth messaging app that doesn't need the internet
Jack Dorsey just launched an app called Bitchat. This is a peer-to-peer messaging service that uses Bluetooth.
Due to the tech at play here, Bitchat also doesn't require Wi-Fi or cellular service. This kind of technology was used during Hong Kong's 2019 protests to keep communication lines open, though similar apps have been floating around for years. A future version of the app will support Wi-Fi Direct to increase the speed and size of the network.
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