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How does the SO voter fraud detection mechanism work?

In stackoverflow, when in a day i get huge number of votes from a single user then the votes are automatically rolled back the next day. Is it an automatic system that if number of votes from a single user goes high then all the votes are stripped off, or is there a moderator for this?


This happens via an automated system, our moderators will only clear votes in the case of sock puppeting type situations, where a large portion of votes were earned illegitimately.

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