Interesting read covering many different issues. Key topics include: Identity (OAuth, XAuth), Profile (XRD, VCard, OpenSocial), Graph (Open Graph Protocol, semantics), Activity (XMPP, AtomPub, Activity Streams, Salmon) and decentralized social networks (OpenLink data spaces).
Abstract
This document is the final report of the W3C Social Web Incubator Group. This report presents systems and technologies that are working towards enabling a Social Web, and is followed by a strategy for standardizing this work in order to ensure the Social Web is open, decentralized, and royalty-free. This report focuses on work that permits the description and identification of people, groups, organizations, as well as user-generated content in extensible and privacy-respecting ways. This report describes a common framework for the concepts behind the Social Web and the state of the art in 2010, including current technologies and standards. We conclude with an analysis of where future research and standardization will benefit users and the entire Social Web ecosystem's growth. We also suggest a strategy for the role of the W3C in the Social Web.
Source: Social Web Final Report

Thanks for pointing out this lucid and comprehensive authoritative report on the state of the social web circa 2010. I was particularly interested in their section on activity as I find that area to be undergoing some significant growth ( see http://it.toolbox.com/blogs/future-of-work/the-age-of-the-activity-stream-41579 ) right now.
Posted by: Glenn | October 16, 2010 at 02:18 PM
w3c is getting important to reach upper rank
Posted by: Mobil Keluarga Ideal Terbaik Indonesia | November 19, 2010 at 01:42 AM
@ mobil keluarga,its really tue if w3c getting important? i think w3c is important,but not most important
Posted by: bibit jabon | May 17, 2011 at 09:36 PM