According to Worldbuilding.SE's help:
Worldbuilding Stack Exchange is a site for developers, designers, writers and artists to get help creating imaginary worlds. This includes geography, culture and creatures for the world. Questions on this site should be about building settings and the reasons around why they are the way they are. A setting might not be a planet; it can be larger than a multiverse or smaller than a village.
Is there a widely published piece of work (e.g. a book with 1000+ copies sold) that made use of Worldbuilding.SE during the creative process?