There are a few projects that try and address this. The issue for 99% of the population is that you need to run it yourself (read run a server) or know someone

There are a few projects that try and address this. The issue for 99% of the population is that you need to run it yourself (read run a server) or know someone who does. You could go the p2p route (I'm thinking Torrents + magnet links kind of decentralised) so you just run a client and connect to the network. Of course this then leads to the problem that users would have to backup their data (which they don't) and be online to participate with no real capacity for offline comms. Which leads back to needing to running a server of some kind.