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Re:Twitter tests Reddit-style upvote and downvote buttons by woko on Thursday July 22, 2021 @05:38AM (#27917049)
Note sure what you mean by "a new metric".

Sorting by "controversy" has been an option on Reddit for a long time. Most people won't use this option, but it exists.

The formula is here: https://github.com/reddit-archive/reddit/blob/753b17407e9a9d...

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