"With Videntity.org you can record your relationships to your friends and family who have websites, weblogs, or OpenID addresses of their own. It doesn't matter where they are on the internet, you just enter their name, URL, and the type of relationship y
Edd Dumbill explores an XML and RDF application known as Friend-of-a-Friend (FOAF). FOAF allows the expression of personal information and relationships, and is a useful building block for creating information systems that support online communities. Code
F. Abel, N. Henze, E. Herder, and D. Krause. User Modeling, Adaptation, and Personalization, volume 6075 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2010)
L. Ding, L. Zhou, T. Finin, and A. Joshi. System Sciences, 2005. HICSS '05. Proceedings of the 38th Annual Hawaii International Conference on, (January 2005)