New message indicators

I might be missing something, but when there are new posts to a channel, that channel moves up right under my name. So I have made it a habit to check there when I pick up my phone. Unfortunately, I don't know HOW MANY groups to go through (i.e., WHICH groups other than the first have new messages). It would be really nice if the groups that have to be read would be highlighted in some way so I know which ones I need to check for new messages. Or better yet, some way to see JUST new messages.