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I like star trek metaphors for this.

In Trek, you have the united federation of planets. You also have the klingon empire and the romulan star empire, and so on. Those would all be named federations. Servers could join one or more them. The users on those servers would get some extra visibility options on their posts. Depending on the rules of their server and their federations, they could post to the UFP, the klingon empire, both, or neither.