This is cool UX and I want to know who verifies questions marked as duplicate.

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    George Stocker does. Every single one. – random Mar 17 '11 at 20:11

Ultimately everybody who uses the site.

Those with a reputation score of 3000 or more can vote to close, but anyone with at least 50 points can add a comment with a link to a duplicate and absolutely anyone can flag a post for moderator attention.

Then, when a question is closed other users can vote to reopen if they disagree with the original decision.

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