I would be really surprised if no one has already suggested something of this kind. but it's kinda impossible to searchbar (new verb).
Anyways i think it would insanely amazingly extreme if you got a notification, facebook style, when someone quotes your response in a thread that you have posted, so you don't have to check. because the chances are that if someone quoted you, then they are replying to something you said, or building off something you said so it may be of interest to you.
sorry if this was already suggested