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Stack Exchange is not a commenting system. Source: I am one of the co-founders.

That seems like an unnecessary nitpick, considering Stack Exchange clearly includes a "comment" feature. Would you care to elaborate?

I think codinghorror is just annoyed that Discourse wasn't mentioned :)

(Just kidding!)

It's a Q&A system with commenting on the Q's and A's. Similar, but different, I guess.

Sure, but even the QA is basically a post/comment system adapted to solve a different problem. It's not so weird to take the lessons learned there and apply it back to general comment systems.

- A reputation scheme for both posters and commenters.

- Pinned responses from the poster.

- The comments appear in a 'best' ordering.

- Bad comments get pushed down and hidden.

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