Prior art

[lastmjs]

• [ ] https://www.reddit.com/r/ethereum/comments/by7wzy/messaging_on_ethereum/
• [ ] https://medium.com/@leonardnguyen/etherchat-decentralized-messaging-application-on-ethereum-network-part-1-253e5078770b
• [ ] https://github.com/nhatminh12369/etherchat
• [ ] http://www.cryptospeech.com/#
• [ ] https://github.com/ethereum/EIPs/issues/130
• [ ] https://github.com/MetaMask/metamask-extension/issues/1190
• [ ] https://github.com/ethereum/EIPs/issues/802
• [ ] https://www.reddit.com/r/ethereum/comments/7w3tn5/would_a_simple_app_allowing_ethereum_users_to_pm/
• [ ] https://www.reddit.com/r/ethereum/comments/81sbyp/send_private_messages_to_ethereum_users_beta/
• [ ] https://ethmail.cc/