Is there any chance to implement this feature to notify the answerer when the author of the question (or anyone) has updated the question beyond 5 minutes? This includes: typos, code alignment, content, or anything that a modification has been made.
Sometimes the user has updated the question and the content is different from the primary content. There are already answers on the question and sometimes these answers will not likely answer the question anymore. Just like this post.
Or maybe is it possible to Implement a button or an option just a like in facebook that will allow a user to follow or unfollow (by default in SO) a post. (points still for the modifications)