Sure, taxonomy is always debateable. It is approximate though. Beyond 4, other dynamics crop up. maybe we need more cultural tools to keep a conversation. Maybe

Sure, taxonomy is always debateable. It is approximate though. Beyond 4, other dynamics crop up. maybe we need more cultural tools to keep a conversation. Maybe the conversation starts to subdivide, some people dominate, other zone out... The "parasocial" dynamic that the author describes is part of that complexity, emerging around central figures in a many-to-many scenario.