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I'm not the OP, but I'd argue that Reddit's voting system discourages a diversity of opinions within a given thread or sub-reddit. Although moderators discourage the practice, most Redditors down-vote opinions they disagree with and up-vote those they agree with.

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Just like in HN and 90% of forums on the Internet?

The only difference is that Reddit threads tend to be so huge that less popular comments get buried easily.

I believe the issue has more to do with the subreddit structure and user moderation, which make really easy to create one-sided echo chambers.

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