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A special case of OnlineCommunityDirectory, where members of each community can contribute to defining or refining its place in the directory, by clarifying how it relates to other communities (in terms of scope, people, or any other factor that is deemed useful).
An example is KnowHow:Find_Interesting_Online_Communities and subnodes.
Take a look at the theory of FuzzyCommunity or SyndicatedCommunity.
See also OneBigWiki, a project being started to do this for wikis.