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It's not that I like to close questions, and indeed I haven't yet, just wondering why.
I earned the privilege some days ago, when I gained a bunch of points in all SE sites, but then, as it turns out, the "close" button disappeared.
At 250 reputation, you earn the privilege to view and cast close/re-open votes on your own questions. The ability to vote to close/re-open others' questions is earned at 3000 reputation here.