Question

Would it be difficult to add a subscribe/unsubscribe button next to a user's question? - I'm sure a lot of users here would like the opportunity to opt out of a discussion that they have previously commented on (perhaps the question has been resolved but there is still ongoing chatter), and in doing so avoid those frequent notifications. Also, there are many questions that I don't know the answer to, but I would like to follow the thread to see other people's answers. I think these two features would be relatively simple to implement, and be extremely useful.