On submissions: if you blocked global news websites, at least a quarter of the top posts would be gone.
On comments: they could solve a shitload of the complaints about comments by just adding meta-votes, like those on Slashdot, and letting individual users define their own filters for what they do and don't want to see. Automating and letting the community manage itself would be so much more efficient and fair than relying on mods, or the extremely vague and unhelpful generic vote button.
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