On: Why is Linux more popular than BSD?

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Recently I was looking on SE question about emacs which was closed but was deleted. Why doesn't someone launch a site for such questions?

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Not exactly what you are looking for, but there are a few archives which try to save the deleted questions from StackOverflow (I don't know about the other SE sites). E.g. http://stackoverflow.hewgill.com/

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Quora?

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Quora had potential, but is dead now. And I mean literally.

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> Why doesn't someone launch a site for such questions?

Occasionally they do. But they take a lot of effort to moderate and generate negligible ad revenue, so they usually do not last long.

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A practical question about emacs would be on topic on unix.stackexchange.com or superuser.com.