It's 100. It used to be 50, but in update 2.40, they bumped it up to 100.
Chat with our AI personalities
There are procedures that are described in the PS3 when you try to add friends and involve sending a message to someone
Just click add friends and then type the person's PSN username
It is a certain model number of a ps3.
Sure if they are actually friends send them an email or just text there cell phone. No you need your PS3 to message someone on the PSN
256 players maximum can play in one match.