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Originally Posted by Zeraph
But even if they see it how do they know what used to be there? Or can you only add new stuff and take away only that which you've typed?
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At the top of every article there are buttons for 'Discussion', 'Edit' and 'History'.
Click history, and you can see every version of the page right back to when it was first created. You can also undo any changes back to any particular version with 'revert'. Hence, it is very easy to undo the effects of vandalism.
In discussion you can see people talking about the article, arguing about what should go in, etc.