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http://www.readwriteweb.com/archives/distributed_social_networking.php

The Distributed Social Networking Puzzle: Putting The Pieces Tog

Distributed social networking - where users can connect their profile, friends and other data across multiple sites - is still a relatively new concept and not fully developed. There are plenty of companies and projects vying to be a major piece of the distributed social networking puzzle.
DSNP is a protocol for distributed social networking. http://www.complang.org/dsnp/

DSNP: Distributed Social Networking Protocol

Silo free living. Social networks are becoming more open, more interconnected, and more distributed .

DiSo Project

http://diso-project.org/
http://www.readwriteweb.com/archives/diso_dashboard.php Long time innovator Marc Canter has made a proposal for a system to let users integrate all their social networks from around the web into one central dashboard.

Could This Be Your All-in-One Social Network? - ReadWriteWeb