Watch Chris Slemp's video* for an overview of TN/MSDN's "social platform" that includes:

Social Bookmarking

Community Content (ak.a. "wiki") - for example see http://technet.microsoft.com/en-us/library/cc753637.aspx

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Forums - for example, did you know the Scripting Guys have a forum?

Blogs

Code Gallery

Oh yeah, search is now part of the social platform

*Hey, who's profile is that on the screen at about timecode 2:07?

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