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The person asking the question could accept the best/correct answer. This could also be what triggers the checkmark emoji to appear.
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We could use a web of trust, like we do with the homepage. 100 upvotes from history-less sockpuppets would count for zero.
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Interesting experiment that would love to see in action.
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what if allow users to vote?, yet someone could create like 100 accounts and vote for someone.