questions and answers have regular updates, you can follow a questions to see new answers, rating of questions provide better understanding of which answers are likely better.

Used SO for Teams for a group knowledgebase offering. Found the service very easy to maintain and collaborate on. Specifically liked the interface for detailing articles, and the ability to vote and have a 'competitive' scoring system for users!

In scenarios with multiple competing answers, I imagine upvotes and marking answers as helpful/correct, would help surface the best ones. In our case, most Qs have simply one answer, or some clarification comments, so SO adds overhead.