I came across this the other day:

     "This paper presents a proposal of a new P2P microblogging platform
     that is scalable, resilient to failures and attacks, does not depend
     on any central authority for user registration, provides easy-to-use
     encrypted private communication and authenticated public posts. The
     architecture tries to leverage from existing and proven P2P
     technologies such as Bittorrent and Bitcoin as much possible.
     Privacy is also one of the primary design concerns, no one should be
     able to see the user’s IP or their followers unless he explicitly
     shares such information. The proposed platform is comprised of three
     mostly independent overlay networks. The first provides distributed
     user registration and authentication and is based on the Bitcoin
     protocol. The second one is a Distributed Hash Table (DHT) overlay
     network providing key/value storage for user resources and tracker
     location for the third network. The last network is a collection of
     possibly disjoint “swarms” of followers, based on the Bittorrent
     protocol, which can be used for efficient near-instant notification
     delivery to many users. [...] "
     -- "[1]twister - a P2P microblogging platform", Miguel Freitas

   Personally, I'm impressed by the creative application of
   Bitcoin/Bitorrent/DHT protocols to the problem of private/anonymous
   communication ... and the software looks very clean and usable as well.
   I also like that it's based on P2P technology unlike solutions such as
   Diaspora, which still require trusting third parties with personal data
   ...
   Thoughts?
   --[2]Jesse Taylor

References

   1. http://arxiv.org/pdf/1312.7152v1.pdf
   2. http://www.interference.cc/