Why (not) logic programming?

Question

I have not yet heard about any uses of a logical programming language (such as Prolog) in the software industry, nor do I know of usage of it in hobby programming or open source projects. It (Prolog) is used as an academic language to some extent, though (why is it used in academia?).

This makes me wonder, why should you use logic programming, and why not? Why is it not getting any detectable industry usage?