Enterprise 2.0 involves building vibrant online communities within organizations through people-centric and participatory approaches. The document discusses paradigm shifts from web-centric to people-centric models and from read-only to read/write cultures. It presents SunSpace, a social community platform architecture that calculates community equity to promote participation across communities, content, and people, integrating with existing knowledge bases. The architecture facilitates building successful online communities through methodology, value systems, and governance policies.