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I remembered someone said that every user has the limitation of voting to another user. Once he/she vote up/down the same user's post more than a certain limit, the excess votes will not bring any reputation to the user. The rule will prevent anyone gaming reputation system.

But I voted up 10 times to a user (Moderator) today, I noticed that his reputation increased by 50 points.

I am confused, how many votes can be given to a certain user in 1 day?

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Chris gave the correct answer. Look in his/her reputation tomorrow and most probably some or all your upvotes will "vanish". – Shadow Wizard Aug 11 '11 at 10:07
up vote 5 down vote accepted

You can give all your votes to a single user in one day.

However, there's a good chance that this will be spotted by various automatic processes that are on the lookout for fraudulent voting patterns and the votes will be removed.

To give all your votes to a single user looks like you are a sockpuppet account created by that user to artificially boost their reputation.

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It seems to me the question is asking how many votes is too many when it comes to tripping that fraudulent voting pattern detector. I often worry about this myself. There are some users active in the same tags as I am that give consistently awesome answers. Logically, I upvote them. Doesn't make me their sockpuppet, though. Similarly, when I come across a particularly bad question, I'll sometimes look through the user's profile to see what other questions they've asked. If they're a consistently poor question asker, I'll downvote other questions to get them one step closer to the auto-ban. – Cody Gray Aug 11 '11 at 11:55
@Cody - I think I know, however I'm reluctant to publicise this fact. There is also a time element. – ChrisF Aug 11 '11 at 11:56
Fair enough about not wanting to publicise it. I don't think I've tripped it yet, but I don't pay close enough attention. – Cody Gray Aug 11 '11 at 11:57

Remember there is a maximum of 200 reputation points each user can gain per day (not involving points for accepted answers).

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