Assume that a user with 2000+ reputation (whose edits are applied immediately and don't need approval) by mistake or intentionally edits a good question or answer and just puts rubbish instead.
Can the original answer or question be restored? How does Stack Overflow detect this kind of people to revoke their edit privilege?
The reason I'm asking is that I like Stack Overflow's system that allows experienced users to moderate the site. I'd like to use a similar system in my own website that I'm currently developing but I'm afraid some users may misuse the privileges they are given.