One of my biggest issues with SO is questions that have been answered but the answer is wrong.  Updating the answer to be correct is REALLY hard, especially when the user was a one off user, who asked a very good question.  They just got a bad answer.<p>Another issue I see with SO is, a question gets answered then the language advances and boom the answer is now invalidated.  So someone asks, &quot;Hey I know it&#x27;s answered here but I think there&#x27;s a new answer, or has something changed.&quot; Those questions get shut down too which is frustrating.<p>I think SO should be a source of knowledge but it doesn&#x27;t handle language versions well or out of date questions well.  It doesn&#x27;t even handle wrong answers well.