I'm not worried about the hangouts for the already converted. They can, and already do, use their own invite-only forums and encrypted chat systems for that. I

I'm not worried about the hangouts for the already converted. They can, and already do, use their own invite-only forums and encrypted chat systems for that. I'm worried about radicalizing the moderates, which is comparable to spam and malware, because (by definition) it's not content that the moderate was seeking out, even if it is tangentially related to the content that they were originally looking for.