The Maximum is 50 friends I heard there was a new update that now allows 100 friends...
Use the message system.
You have to break this down for your self. Do you have friends on either system? Do they(Your friends) have online capabilities? Honestly The Xbox 360 and PS3 Are quite the same so break it down for your self i think ps3 is the best dont even think about it bye ps3!!!!
The max is 100 for both the (PS3 slim and the fat PS3), it used to be 50 though. ,iiGrAviTy http://YouTube.com/McAsSF
There are procedures that are described in the PS3 when you try to add friends and involve sending a message to someone
No of course not PS3 games are for the PS3 system and do not play on the PS2
its for the whole ps3 system
On ps3 xmb... go to settings go to system settings scroll down to restore ps3 system
No the PS3 and Xbox 360 are on different networks
If they also have a PS3 you can add them,
If your friend has a ps3 and you both have psn accounts then yes
well you can get messages from friends and you forward it to your friends and it will give you 10.00 to 50.00 ps3 online money to spend after a week
Yup, your playstation network account is separate from your PS3.