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I and my friend are both members of Stack Overflow. I told my friend to vote me up. He upvoted almost all of my questions and answers. I got almost 150 upvotes. On the next day, when I visited Stack Overflow, I found my reputation as it had been before the upvotes.

How does Stack Overflow identify, differentiate, and track dummy/unnecessary upvotes?

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marked as duplicate by gnat, rene, S.L. Barth, Ward, Nathan Tuggy Jul 19 at 16:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

16 admit that you tried to cheat? ;) – Time Traveling Bobby Aug 11 '10 at 7:44
Just so that I can sleep tonight... was the other user Jon Skeet? – uɐɯsO uɐɥʇɐN Aug 11 '10 at 8:05
What? There's no collusion tag? – Peter Ajtai Aug 11 '10 at 23:15
up vote 16 down vote accepted


In fact, we have a whole community who does nothing but help us figure out statistical anomalies in voting.

Say Hi to them at

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Wow. What an interesting way to promote a SE site! :) – uɐɯsO uɐɥʇɐN Aug 11 '10 at 8:04
@sugar: Because someone has answered it and the answer has an upvote. – kennytm Aug 11 '10 at 9:30
Because another anomalie has been detected probably. Don't worry about it. – Tom Aug 11 '10 at 9:32
@sugar, why, trying to hide the evidence when it's too late? :) (…) – Benjol Aug 11 '10 at 10:12

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