Question: Will online connection be required to activate the game? Even to play the single-player? Do I have to always be online when I am playing any mode, or do I only have to be online for the initial activation?
Answer: An online connection is only required during install to authenticate (or create) your Social Club ID – from there, you can play the single-player story offline if you'd like with game progress saved locally. However, it's recommended you play while connected so that you can have your game saves saved to Social Club and unlock achievements.