As we announced on Meta Stack Overflow, we are kicking off a project to begin tackling the issue of outdated answers. That post goes into detail on the initiative and our approach.
We are focusing our initial research efforts on Stack Overflow, and not on other sites on the Stack Exchange network. We understand that the issue with outdated answers is not exclusive to Stack Overflow and other technical sites may have similar issues.
However, none of the other sites operate at the scale of Stack Overflow: more than 31 million answers, compared to 11 million for the rest of the network. And Stack Overflow is our oldest site, so it is the site where the pain is most acute.
Rather than trying to shoot for a one-size-fits-all solution that may actually fit none, we are laser-focused on uncovering the Stack Overflow use cases and coming up with initial solutions that work really well for Stack Overflow.
We are optimistic that many of the learnings from Stack Overflow will also be relevant and helpful for similar issues faced by other sites on the network. As we get further down the road, we will evaluate whether the Stack Overflow solution can also work for other sites and solicit your feedback here on Meta Stack Exchange.
With this in mind, feel free to share any initial thoughts on how you've experienced outdated answers on other Stack Exchange sites and any ideas you have about ways to attack this problem.