When I first started Duolingo I was getting the notifications in my notifications box that told me when someone responded to a discussion that I was following, but I am not getting those anymore, I tried looking at my settings to see if there was a setting that had that but there is not, but I could have sworn I was getting them, I am getting them on my Email, but I don't want to have to go to my Email each time to see if someone responded to me, and I am not going to sit at one discussion until someone does. It is truly annoying. I wonder if anyone else has this problem, and if anyone can help me.
Are you making sure the green box at the top of the discussions you want to follow say "Following Discussion", not "Follow Discussion"? Any discussions that you've set to "Following Discussion" should then appear under the "Followed" heading on the Discussion Stream page when someone comments on it. (That's how it works on my laptop anyways.)