This depends on the game your are playing. Some allow this, and some don't.
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256 players maximum can play in one match.
Yes
yes
Online you can get up to 256 players, but if you mean the whole community you'd have to look that up.
It depends on the game, but 7 controllers can work on the PS3 and some games have more than 4 players although many only have a single offline player. Online MAG may have 250 players i think 2 players