mcc@evan If this is the "Fediverse", it has user pairs that can't see each other. But there are hops where user `a` on server `A` can mutually speak with user `b` on server `B` who can mutually speak with user `c` on server `C` even though `a` and `c` are visible to each other. So you *could* describe this graph subset as a connected component. You have a notional community because `a` and `c`, due to their mutual conversation with `b`, share a milieu.
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