A (digital) social network, which (by design) restricts direct communication to pairs of users who are friends, possesses many of the security properties (privacy, anonymity, deniability, resilience to denial-of-service attacks, etc.) that human sociaties implement organically in daily life.

Could be a nice Dropbox replacement someday.

"simple, reliable, mid-scale p2p messaging and storage"

BTSlave is a “slave repeater”. A BitTorrent repeater is a client that only downloads data when no one is interested in the data it already has. Repeaters can achieve very high upload/download ratios, and they help the other peers in a torrent download

a sensible alternative to BitTorrent

collaborative RSS and Atom delivery