jfriend

That's Joel's version of link bait headline. It works nothing like a wiki. But of course, you already know that if you've used Stack Overflow. But, tomato, tomato.

FWIW, Stack Overflow for Teams isn't a wiki.

~50 monthly visitors. The key here is you don't need an account to get the value. https://stackoverflow.com/company

Microsoft built several of these Q&A systems that are "easily achievable by any competent group of engineers". They never really took off until they got Stack Overflow Enterprise. So, I guess it isn't really that easy.

Note: I'm a former Microsoft PM and currently a Stack Overflow PM. My POV comes with bias.