No. If you create another user on your system you can. But that is the only way.
no
You're wrong. The PS3 has over 60 million online accounts, while the Xbox is looking at I believe 30-40 million. The PS3 has double the users of Xbox and Wii.
Yes
Sounds like normal online playing
No only one account at a time and the same account can only be active on one PS3. You can have multiple accounts for the PS3 with only one actively signed in and the other accounts not signed in
There is no two player online for mw2 on ps3 or xbox 360
uncharted 2
yes you can play 2 players online on world at war on the same ps3 screen
You cant play ps2 games on ps3...
Over 70 million people have PSN accounts that are not PS3 accounts but allow the PS3 to connect to the Playstation Network (PSN) and use it
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
Your PS3 needs an internet connection to play online and the game is a PS3 exclusive that only has online play through the Playstation Network