None that I'm aware of. But to be honest, I wouldn't even use a facebook-sharing function. I've never seen someone on facebook share something from a game, that happened before in 2012, but since facebook really isn't that popular anymore, shares will probably not happen anyway. Even if they do, they'll most likely have 0 effect, tbh.
In my opinion and experience, a facebook share option really isn't part of modern game design. And can be seen as quite annoying to users