I suppose RetroShare and GNUnet are similar in that they have 'Friend
   to Friend' capabilities, but as we see in practice, they don't create
   high-quality networks because there is no hierarchy of trust or
   discoverability of new users - by default, users can't interact with
   'friends-of-friends', which means that what should be "Private P2P"
   networks degrade to "Group P2P" networks of only a few people. This
   proposed system should be able to accommodate thousands of users while
   still providing the aforementioned benefits.