Sentence one is good enough for me: I'm of the opinion that online communities that focus around a specific topic or group of topics... That's not really the k

Sentence one is good enough for me: I'm of the opinion that online communities that focus around a specific topic or group of topics... That's not really the kind of community that you expect to last very long, is it? At least without a change of topics. He also seems to assume a priori that effective moderation is impossible, and thus that off-topic and banal discussion is inevitable -- which seems to me like assuming the conclusion.