I think the best solution to maintaining the quality of a rapidly growing community/vote driven site is restricting the flow of new users by providing disincentives. Metafilter (for example) has a $5 sign up fee.
Requiring a small karma minimum before allowing users to vote on posts & comments, or submit new posts could work well. This way new users can only influence the community by engaging with it, which would filter out votes from casual users and trolls, while also giving new users a chance to grasp the community norms though participation.
Other approaches like vote-weighting and down-voting ignore the root of the problem, which is dilution of the community and its norms.
Requiring a small karma minimum before allowing users to vote on posts & comments, or submit new posts could work well. This way new users can only influence the community by engaging with it, which would filter out votes from casual users and trolls, while also giving new users a chance to grasp the community norms though participation.
Other approaches like vote-weighting and down-voting ignore the root of the problem, which is dilution of the community and its norms.
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