Jack Dorsey just launched a chat app called Bitchat Bitchat is a peer-to-peer decentralized communication tool that is completely independent of network operators. It runs on a Bluetooth Low Energy (BLE) mesh network, with encrypted information, short-lived existence, and no trace left. Even in extreme environments of internet disconnection and blockade, it allows people to continue to communicate freely, with an effective distance of up to 300 meters. The product is very low-key and the name is very loud.