If you hit the "more" button a pop-up appears with two options and they are:
Flag as spam/abuse
Reply Notifications on
The first one is self evident as it conveys the fact you want to take an action and flag something as spam (although not much action is usually taken) but is the second item a statement or an option? It's no evident from that whether it's telling me the notifications are already on or whether I should click on that to turn the replies on. Perhaps I'm just a bit dumb but which is it?
Perhaps the second item in that list would be more clear if it were listed as "Turn Reply Notifications on" or "Reply Notifications are on".