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What are the 'procedures' in place for downvoting? Because it is rampant daily. Maybe have a limit of how many times a person can downvote in a day, and undoing the downvote does not add back to the daily bucket.
Maybe a limit of 20 a day or something. And even if you downvote something and undo it, it still counts towards your daily limit.
Customer support service by UserEcho