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For questions about the system that allows the display of approval and disapproval, and determines user reputation, hence privileges. For questions about voting applied for other purposes see other tags, for example [vote-to-close].
There are currently 21,622 questions on Web Applications that are not closed or deleted.
Of those, 3,246 have no answers at all.
Worse, I think, is that there are 1,363 questions with answers, none ...