Yeah, weighting 'engagement' higher is basically the youtube algorithm problem: you'd be attracting trolls most of all. You could probably devise something smarter, like weighting it to include all of most upvotes, fewest downvotes, and most comments; adding comments to it helps identify people who post positive but engaging things, but again that can lead to an echo chamber. Plus, it then under-weights new users compared to established ones, which can be unfortunate.
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