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I have to imagine the creators of these sites built a mechanism to detect "Vote Fraud". Is there something to stop someone from creating two accounts and continuously vote for each other to build reputation?

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You're going to have to point us to the extra accounts you're using to provide a better example. – random Nov 4 '09 at 1:39
up vote 9 down vote accepted

Yeap. It is covered in this blog entry: "Vote Fraud and You" and this one: "More Voting anomalies" on blog.stackoverflow.com

Basically SO query the database from time to time and if they find that a user is just upvoting some other specific user, they all the points from that user are removed.

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Basically... what? – blahdiblah Nov 4 '09 at 2:19
    
heheh I forgot what I was going to say.. ohh yeap.. basically.. – OscarRyz Nov 4 '09 at 2:44

This is called sock puppetry, and yes, there are tools to prevent it and appropriate recourse when it occurs.

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I've heard Jon Skeet (aka Tony the Pony) is a master of sock puppetry. ;) – Dominic Rodger Nov 4 '09 at 9:46
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Jon Skeet's socks have a higher rep than most of us – Steven A. Lowe Nov 4 '09 at 15:53

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