Hacker News Reader

Hackernews is an interesting example, as it is HEAVILY moderated, and some would say that this leads to a much higher level of commenting quality.

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for most topics, I'd say the quality of conversation is high, but for some topics HN is pretty much an echo chamber. Some unpopular opinions for some topics are down voted pretty heavily, and very quickly.

Sharing an unpopular opinion on certain topics often leads to immediate downvoting of completely unrelated posts made earlier.

"You said something I don't like. Let me just click on your profile and downvote everything I can". Happens surprisingly often

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