> **Possible Duplicate:**  
> [I observed that my reputation decreases when I downvote answers, why?](http://meta.askubuntu.com/questions/2383/i-observed-that-my-reputation-decreases-when-i-downvote-answers-why)  

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Do you loose reputation if you downvote an answer?  Is there a document that shows you the different points you can get for different things?