My reputation on Stack Overflow was lessened by 105 points today. Does anybody know why?
Since You have violated the voting rules and regulation of Stackoverflow
Take a look at this
I think this is to prevent someone spammingly upvote everything he sees on SO. Suppose someone wants to get more reputation he can simply apply for another account and build enough reputation, then upvote every answer of main account. That way the main account can get thousands of reputation that way. Just to point out that reputation building is SLOW process :)
Vote reversal as a result of voting fraud will also return lost or gained reputation.