After a few hiccups, Facebook has gotten the notifications scrolling back and much better than Google Plus. This gives it a cleaner advantage in social gaming interface – even for the same game. and of course many more gamers!
Clearly the games stream is much more efficiently designed in FB, probably because they need to earn some ad revenue- that forces you to think more optimally for space. FB interface is also bug free compared to the constant error in G+ (error changing circle membership– ideally I wanted to create one gaming circle for all gaming friends)
See this – not just compare the games stream/notifications only