Question: Consider this situation. I post a legitimate and correct answer to a question and receive a few upvotes. Then the OP realizes that's not what they wanted to ask, and significantly rewrites the question, rendering my answer irrelevant and useless. Ideally the OP would comment on every answer saying "check my edit" but *some people don't know to do that*.

This leaves two possibly bad situations:

1. I never know, the answer stays, and the votes don't reflect the usefulness of the answer anymore.
2. All of a sudden I get an influx of downvotes because my answer isn't helpful anymore. *If I'm checking and notice my rep has dropped*, I come back after the fact, edit the answer, and bring it back to the original quality. This is great, but 9 times out of 10, the downvoters never come back and notice the answer has been edited. It might get more upvotes, but it still doesn't reflect the true value of the answer.

If we can get notified when the OP gets edited, we can nip it in the bud and go back to edit our answers to match - thus maintaining the quality of the answers on SO.

Answer: 
I've had similar [experiences to Cletus](https://meta.stackexchange.com/questions/2322/notify-us-when-the-question-has-been-edited-after-posting-an-answer/2324#2324) where the answer I posted was the first and correct, but over time the question changes and all of a sudden you can get hammered because you were unable to keep up with the changing requirements of the question. This can definitely get very annoying.

This would also be incredible useful for those of us who monitor questions to close. If this was combined with the ability to remove a close vote, it could allow us to vote a question to close when it doesn't meet standards, and when it is revised, we would get notified and be able to then remove our close vote if we felt it was an improvement.
I currently have a large number of posts bookmarked so I can monitor them. In each case, I have posted an answer based on what I thought the OP wanted. However, the question was interpreted differently by other posters.

Of course, I could have waited for the OP to clarify the question before answering. However, I have found that I have a high rate of success correctly interpreting the original meaning. And I may not be around when, if ever, the question is clarified.

I used to star them and use the favorites tab to monitor them, but I really don't want these cluttering up my *real* favorites. Using browser bookmarks means I have to manually follow up which is a pain.

Having the ability to subscribe to posts is probably redundant since that is effectively what favorites is, but I'd really like to have some mechanism to monitor activity on questions I've answered (without having to star them).

**Possible Solution**  

Maybe the answer tab could work similar to the favorites tab so that the tab and individual answers get highlighted when there is new activity on the question. I don't think notification of favorites activity goes to the inbox so it wouldn't be *spam*.

**Another Possible Solution**  

Add the ability to categorize favorites. There is [a feature request](https://meta.stackexchange.com/questions/75944/favorites-improvements) that suggests several improvements to favorites. One could use favorites to receive notification on any question and then use personal tags to keep those favorites organized. I think this solution would *kill two requests with one feature*.