I think a better alg is the author of the max downvotes on one person.
Yes, I believe that this is similar to what I have suggested. A mass downvoter would be a strong outlier on the 30-day downvote histogram (# users who downvoted vs # downvotes they gave) of a given user.
Yes, I believe that this is similar to what I have suggested. A mass downvoter would be a strong outlier on the 30-day downvote histogram (# users who downvoted vs # downvotes they gave) of a given user.