W is for Worldbuilding

Even though I have posts on here where I talk about worldbuilding but I'm still terrible at actually doing it before writing. But why worldbuild?

For one, I tried to write a scene from the novel that I'm kinda sorta worldbuilding through these posts and not having figured out the world stalled me for over 30 minutes. What caused the stall? I had no idea what to call the "store" that sold the fake starlight that had been ransacked. Just calling it a "store" didn't feel right for the world. So, because I hadn't figured out the world, the writing stalled.

I have a new idea that I've been working on for a character sketch challenge. However, since this is a science fiction story, I think I will have to worldbuild for that one too.

Guess I'd better get worldbuilding.


Links:
http://www.web-writer.net/fantasy/
http://hiddenway.tripod.com/world/
http://www.sfwa.org/2009/08/fantasy-worldbuilding-questions/
http://yamuses.blogspot.com/2011/12/world-building-checklist.html



Do you worldbuild?
Why or why not?