plscommunityboundaries (ThoughtStorms)

Part of PatternLanguageForTheSocialNetwork

Controversial. Boundaries are part of a trend towards exclusivity (NetoCracy)

But boundaries also preserve the integrity of communities which might otherwise be destroyed through rapid turnover of members, hostile InternetTrolls, or simple leakage to disparate other similar localities. (CreatingCommunities)

A boundary can be formed in many way. A community may be simply obscure, or require registration or require invitation from an existing member, or run using a more obscure technology (FreeNet, P2P protocol), or run at a different speed (WorldsWithinWheels)

See Alexander's architectural pattern Neighbourhood Boundary

See also AutoPoiesis, AlternativesToCompanies