I actually think they reside at the heart of this model, in a way that is even more exciting than the current paradigm. Sure, twitter might be good in some regards, but have you looked at the vitriol directed at the most prominent individuals? It’s a cesspool.
Through this model, the celebrity/influencer operates in the central group chat. This branches off to super fans and less casual fans, who have the opportunity to progress towards the centre and have direct interactions with them. Perhaps their messages proliferate through to every element of the web, but only certain levels are allowed to interact. This creates a self regulating community who promote the individuals adding value to other participants.