There's too much fighting in the world. How unusually pleasant, then, for Xbox to offer simple congratulations to Sony on the launch of its PlayStation 4. The Xbox Twitter account was adorned Friday with this message: "Congratulations on your launch, Sony." All right, it wasn't exactly lyrical. It may not have been entirely heartfelt, either. But most of the time we're used to one tech company explaining why another's products have feet of clay.