Bitmessage
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 I recently stumbled upon a P2P messaging program, and wonder if anyone else had heard of it or is using it. 
 Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide "non-content" data, like the sender and receiver of messages, from passive eavesdroppers like those running warrantless wiretapping programs. 
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 It seems secure, but heavy on the traffic side of things, as it downloads and attempts to decode every message 'on the line'. 
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 I've heard of it, but never looked into it. If it's looking at every message on the line, it sounds like it could be block chain based. 

