Many games has one, eg. all the Zynga games has a unified one.
If galaxy legion had one, you could eg see your energy, how much xp left to level up, timers on your abilities (Hack/raid, racial abilities from Kronyn etc., and mission related ones).
Maybe a timer and/or amount of mineral/arti/research stored too?
Naturally it should also let you open the game if you clicked on it

I guess it would serve the purpose of letting you see how your game is going without actually having to go inside facebook and then GL if you dont have to.