My SteamID is "Fixumi" (without "" )
I usually play Portal 2, mostly online(with specific friend) occasionally with random people.
I also play Age of Empires Online, only single player, frankly never played online with random people or friends.
Edit:
Oh and my cousin(he doesn't have OSU!) has also a steamID and I asked his permission to post his steamID here and its ok.
His steamID is "RoB0X_" (without "" ) he only plays Portal 2 Online and he's not very good at English but he tries(I sometimes help him with his English), or else you will notice if his English is a little bad.