Different contexts call for different approaches. "Write once, publish everywhere" is ideal for read-only content. For a social network that is user-centric/ide

Different contexts call for different approaches. "Write once, publish everywhere" is ideal for read-only content. For a social network that is user-centric/identity-focused (like Twitter), federation makes sense; for a social network that is "topic-centric" (like Reddit) you can just have individual forums like the old days.