On: Distributed karma: an idea for fixing recommendation systems

[ashu]

This is of relevance:

Haifeng Yu, Michael Kaminsky, Phillip B. Gibbons, and Abraham Flaxman, "SybilGuard: Defending Against Sybil Attacks via Social Networks." Proceedings of ACM SIGCOMM Conference , September 2006

http://www.cs.cmu.edu/~yhf/sybilguard-sigcomm06.pdf

In effect, this paper provides a way of "scaling" a trusted social network and minimizing the influence of sock-puppet accounts.