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Instead of downvoting to below zero, one could suggest a tag for the question that would identify it as a kind of question that the downvoter would like to avoid reading in future. Downvoting a particular question below zero doesn't do anything about future questions that are similar.
Downvoting does not signify for me (nor for any of the other Community ...
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Since the link in the accepted answer seems to be dead, here is a solution using SEDE. We're looking at comment replies used below posts by a given users and after comments by a given user. This is by no means foolproof, but usernames of the given user are certainly more likely to appear in such replies.
Usernames used in possible comment replies to posts ...
Only top voted, non community-wiki answers of a minimum length are eligible
