Yes course you can
They can not. I do not know the reason for this but I know that online games are not mixed with the PS3 console.
In Titanfall, you can have up to two players on the same console playing in split-screen mode for the campaign and private matches. However, the game does not support split-screen for online multiplayer matches. For online play, each player needs their own console and account.
yes
It is up to 24 players online, however only one person can play on a single console.
You cannot play multiplayer (2-player) on the game. You can however, play online with other players. But you can only do 1 player per console.
Unfortunately, you can not play the campaign mode with more than two people on one console.
It depends on the game, but in most games only one person at a time can play online per platform or console
No, you cannot play cod world at war online with two players on same console and samething goes for call of duty 4. But you can for halo 3.
In a single player game you can not play split screen or 2 player on the same console even if it is a multiplayer online game
No, but you can link the Vita to the PS3 console
It depends on the console. I play on XBOX 360 and that requires a XBOX live membership and a working access point.
Some games, like Halo 3, allow 4 players to play online at the same time on one console, but most game do not allow multiple players online at a time on the same console.