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?

  • 17
    So...you admit that you tried to cheat? ;) Aug 11 '10 at 7:44
  • 5
    Just so that I can sleep tonight... was the other user Jon Skeet? Aug 11 '10 at 8:05
  • 1
    What? There's no collusion tag? Aug 11 '10 at 23:15


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

  • 6
    Wow. What an interesting way to promote a SE site! :) 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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