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I disagree - I find the stack overflow model much better than a wiki. In practice the search on SO is much better than a wiki because of how the questions are phrased. Using your how do I (x) example that is how the SO title would be phrased and that is how a developer searches for a solution.

Facebooks API docs are improving too - so this combination of quality docs and SO could be great.

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The SO model works better is the API never changes - but since it does, a Wiki would probably be best.

I've both responded to SO questions with updates, as well as had one of my top answers be replaced by a newer, better solution. In browsing questions, I've also seen a number of updates to existing answers.

I guess the point is, if you've spent a lot of time figuring something out, and you've proved that a number of solutions on the internet are now wrong, you're tempted to make it easier for the next guy. I think this is true regardless of the medium, but SO seems to have done well at creating an environment where it happens.

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