[kohanz]

I'd say no based on the fact that you see most user-driven forums experience this problem. I can't remember how many times I've seen a pinned post or set of rules to exclaiming "use the search function before posting". Even StackOverflow has many duplicate questions despite possibly having some of the best built-in workflow to prevent that from occurring.

[chung-leong]

It's different at SO. Generally a poster would follow up on their question. At Quora, posters would ask questions and not say a peek after. Lots of copy-and-pasted answers as well.