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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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15  
So...you admit that you tried to cheat? ;) –  Time Traveling Bobby Aug 11 '10 at 7:44
4  
Just so that I can sleep tonight... was the other user Jon Skeet? –  uɐɯsO uɐɥʇɐN Aug 11 '10 at 8:05
1  
What? There's no collusion tag? –  Peter Ajtai Aug 11 '10 at 23:15

1 Answer 1

up vote 16 down vote accepted

statistics!

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

Say Hi to them at http://stats.stackexchange.com

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4  
Wow. What an interesting way to promote a SE site! :) –  uɐɯsO uɐɥʇɐN Aug 11 '10 at 8:04
1  
@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
6  
@sugar, why, trying to hide the evidence when it's too late? :) (thefirstpost.co.uk/…) –  Benjol Aug 11 '10 at 10:12

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