No
Yes. There are infact a number of girls who are interested in playing Call of Duty Ghosts with you on the PS 4 if need more friends.
You need to have the game in your harddrive to play online
No you need the same game to play against someone
you need to buy call of duty mw3 and you need to register for call of duty elite
You need to have your friend's "Friend Code" to add him as a friend.
the answer is no unless you want to talk to friends in that case yes but if you are just playing then no even if its online you can't use an earpeice if you are in story
No, you can do offline solo/split screen or online with three other players.
Its something special to play.You need it to install it and to play online!
You don't need a hard drive to play call of duty world at war, but you won't be able to save any data online or for single player.
You need an online connection to your PS3 and then you make your purchase from the Playstation Store
You need the game in the PS3 to play it online, then it is an option available if you are also able to go online
You need to make your own party in black ops and go to there profile and invite them