Web 2.0 is about collaboration, but collaborators labor together; they build things. Platforms are places where collaborators build. The tools for building are becoming ever more powerful and easy to use.

Some "Intro to 2.0" reading:
http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html


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Go2Web20.net