The most useful thing I find is just to contact friends. If I need to chat to someone then I know that if I send them a facebook message they'll most likely read it and reply within the day.
I don't have those friends anymore. I deserve better. If someone can't take the time to reply to a simple email or text unless it's through Facebook, they're not worth having as friends. Yes, you may lose some friends, but the ones you keep you know are going to be there for you.
I would not want to be your friend.