Kuro5hin had an editorial system, where all posts started out in a special section where they were separate and only visible to logged in users. Commenters would label their comments as either "topical" or "editorial", and all editorial comments would be deleted when the post left editing; and votes cast during editing would determine where the post went (front page, less prominent section, or deleted).
Unfortunately, most of the busy smart people only looked at the posts after editing, while the trolls and people with too much free time managed the edit queue, eventually destroying the quality of the site and driving the good users away. It might be possible to salvage that model somehow, though.
We upvote much more than we downvote - just look at the mean comment and post scores. Also, the number of downvotes a user can make is capped at their karma.
Enthusiastically seconded.
The only change I'd make is to hide editorial comments when the post leaves editing (instead of deleting them), with a toggle option for logged-in users to carry on viewing them.
Unfortunately, most of the busy smart people only looked at the posts after editing, while the trolls and people with too much free time managed the edit queue, eventually destroying the quality of the site and driving the good users away. It might be possible to salvage that model somehow, though.
I think it is. There are several tricks we could use to...
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July Part 1