The PS3 system will continue to support up to 100 friends at one time. If you build a friend list bigger than 100 on PS4, Vita, network servers will automatically filter your friend’s list when you play on a PS3 system.Additionally, you will be able to set and lock a pre-determined friends list to be used while you play on the PS3 system.
For the details on which of your 100 friends will be displayed, Sony gave out this explanation:1. If you have sent or received Friend requests that haven’t been approved yet, up to 10 of the most recent recipients and 10 of the most recent senders are displayed.2. Your Friends are displayed:If the sum of players from point 1 and your currently online Friends is more than 100, your currently online Friends are displayed by online ID in alphabetical order until the limit of 100 players is reached.If the sum of players from point 1 and your currently online Friends is less than 100, your currently offline Friends are also displayed by online ID in alphabetical order until the limit of 100 players is reached.3. If the sum of players from point 1 and all of your Friends from point 2 is less than 100, any remaining recipients of your Friend requests are displayed, followed by any remaining players who sent Friend requests to you, until the limit of 100 players is reached.Note: You must sign out of PSN and then sign in again to update the players who are displayed. When doing this, also sign out of all other devices that you are signed in to PSN on.