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Email is already distributed. You can run your own mail server. Usenet and the Freenet forum whose name I've forgotten have already done it, they just have few users. Bittorrent is pretty nice for distributing video. No streaming, but there are tradeoffs in everything. irc? To distribute files? Freenet is probably closest, torrents are probably a better choice. As a private backup? Disks are cheap, and colos aren't that expensive if you want remote backups. I don't know, those sounds like interesting problems.or of an email service
Reddit
or of YouTube
or Twitter
or Dropbox
of Google
or Skype