> Understood, but that is not what SO represented itself as. They called themselves a Q and A site, not a wiki of fact-checked information.

At the beginning, even Atwood and Spolsky didn't really know what "a Q&A site" is. They didn't have a precedent for what they were making; that was the point of making it. Even Quora came later, and it's useless now because they didn't get it.

It turns out that a Q and A site actually fundamentally is pretty close to "a wiki of fact-checked information", just with Qs as a prompting and labeling mechanism. (Which really isn't that surprising; if you've seen e.g. science books for children in Q&A format, you'll notice the Qs are generally unrealistic for children to ask. I remember one that was along the lines of "is it true you can get electricity from a lemon?", used to introduce a description of a basic copper-zinc battery cell.)

By 2011 or so, at least Atwood had figured this out, and was publicly blogging to explain it. By 2014, a core group of users clearly grasped the idea, but was still struggling to figure out what kinds of close reasons actually keep questions on target (and were also struggling with a ton of social issues in general).

> Right now, the only description of the SO site is on stack-exchange

Not true. https://stackoverflow.com/tour