I've been having issues with the difference between a star and a heart myself. I had thought favouriting was just a way to put it into a little faves gallery, and that promoting made it show up in other people's notifications as something I did, but I'm being told that the heart means you're doing it anonymously, and the star means it's public? It's confusing u.u

I agree that having the star be replaced with an arrow or share-like button of some kind would be really helpful.