Plugin to add voting in posts like digg

Is there any plug-in that i can use with vBullet开发者_如何转开发in to add thumbs up or down kind of voting to all posts?

I want to allow people to vote up or down on every post.

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I got my solution i found product for vBulletin which is called "Helpful Answers", it has thumbs up and down feature like i wanted and has couple of other features too.