GitVersionControl as a WebTwoPointOh social networking site. http://github.com . virtual colleagues read each others integration comments the way civilians read TwitterFeeds.

Also increasingly used as a web hosting back end and document repository - http://pages.github.com/. Anyone (with access) can clone, edit and push their changes.

The SourceForge of Web 2.0.

See example of SmallestFederatedWiki.
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CategoryConfigurationManagement
WikiLikeThing