This site host diki - the distributed knowledge infrastructure. It is a friend-to-friend (p2p-like) based infrastructure that aims at providing a social semantic web without central servers. Thus it provides the privacy that most application still lack of.
M. Horng, M. Hung, Y. Chen, J. Pan, and W. Huang. Computer Information Systems and Industrial Management Applications (CISIM), 2010 International Conference on, page 487 -490. (October 2010)