I have never used FB and I've lost out on nothing. My wife has it on her computer, which she does not even switch on everyday. She looks at Facebook from time to time but is it a pillar of her life? No not ever. As for having it on a mobile, if I am out and mobile it is because I am doing something and therefore engaged with an activity. Why would I want e-mail, facebook, or for that matter some dumb arse PPI sales twat calling me?
Sadly I do get the PPI calls, but never borrowing means that I have never wasted money on PPI either. The money saved on loan interest means that if I want something I can now borrow from myself and no one comes chasing if I do not pay 'me' back!