every where. multiplayer
Anywhere there is a television and an online connection, you can play cod online.
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you cant play the normal campaign online but you can play spec ops with two people online
Not online but in regular multiplayer you can
On xbox 360 yes, by pressing your xbox logo button on your controller and pressing "join xbox LIVE". After you create your personal info (gamertag, email, etc.) and pay, then go into COD, press multiplayer, and xbox LIVE.
Yes, you can.
Play multiplayer matches and after the match is over you will see that you have gained cod points.