Current status of anonymous file sharing - most secure thing you can do in 2 steps,
considering global mass surveillance of the Five Eyes:
1. Using Freifunk for building up a wireless hardware community network
2. Using either GNUnet/secushare or Freenet for building up a software friend-to-friend darknet,
on top of said wireless hardware community network
Both is Free Software, GNUnet though uses the Free Software License, which
not only respects users' freedom and community, but also defends it the most:
GNU AGPLv3 or later.
Having lower security demands, raises the question:
If not Freifunk + GNUnet or Freenet, then why not simply aMule or torrents?
Same low security level as retroshare, much more popular,
leading up to more users, more content, more availability. Loneliness problem solved.