I'm not sure The Zeitgeist Movement is a cult, I've never really agreed with that particular label. But I do think it is an e-sect (or Internet-Sect) that promotes an isolating and unhealthy world view. When something almost entirely exists on the Internet, I think it is fair to criticize how moderation is done. On the surface, yes, it was just a forum. But in the context of the e-sect,
Forum:
"Cults," Sects, and "New Religious Movements"