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This is the most eloquent way to put it. Just because there is agreement, does not mean that there is an echo chamber. I am sure there is plenty of disagreement on the site. If you have friends with differing opinions about something, chances are good you started out with a great affinity for something, a lot in common, and a general worldview that aligns... and then when you found your differences, you explored them together. That's what communities do.