Cause you know that login with facebook ON EVERYWEBSITE which requires the information to be shared to facebook so they can do the exact same thing with their ads is TOTALLY DIFFERENT.
the us stands for User screen and as 'us' because now you can play on two wii u screens at once making it an us experience rather then a you experience.
I'd begrudge that while amazing MW4, its like madden now, it's online dwindling is there anything worth playing if no one is online to play it? I'd say no and thus MW shouldn't be on anyone's best of list, but i understand the importance and what it brought when it brought it probably warrants it a spot.