Replying to Notifications

i don't know if this idea has been thought of already but i think it would be really cool. every time someone quotes a person's response in a thread the quoted person would get a notification. i know the thread already goes in the "my threads" section but it doesn't say if someone quotes you in response to something you said. this would be kind of like the way facebook notifications work except instead of when someone comments on something you said it would be for when someone quotes something you said.