No.
no
you absolutly can't
Not on the PlayStation Network
Play more and read the wiki on MW3
Yes.
no is doesnt
i don't know why yours doesn't go online because when i play mw3 it works online and everything. maybe its your system or the game so you should have it checked out
on xbox 36o you can play split screen online
only 0.0004 mbps
You play the game online and rank up to open it.
there is core maps which you get with the game and there is some you need to buy the dlc to play on
No you can only play mw3 on xbox 360 (and pc and ps3 of course) not on xbox.