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I liked one of Jeff's comments on reddit: That's an odd sentiment since those two parts are at odds with each other. Having a flat structure (with optional context ala Twitter) allows each post to be voted on, and sorted in the list, independently. If you are a slave to the parent-child reply hierarchy, you could have the most brilliant upvoted post in the world, trapped way down deep in branch 5 of the tree where nobody can see it.> Combined with the ability for useful threads to bubble up to the top via voting, I think threading is an absolute necessity on a site like reddit.