I don't get people moaning about FB.
It's not like we're born and tagged to have a FB profile or not get a birth certificate, nor are we forced to put in every details to promote yourself if you're just there casually. We all know they target their marketing, they need to make a living on your free info, that you're using for free. T&C, it's all there.
FB is there for anyone to use, you don't have to pay, you don't have to promote. Like many have said, it's a tool for you to use. Don't like it, move on, if you're worried about how people judge you because you have no FB, you're no different from people who use FB promoting themself to be judged.
I personally love it, it allows me to know who I know should keep close or at arms length. For some reason, people on FB shows a lot more of their inner thoughts.
Got someone that started ranting and posting their thoughts on other people based on colour whilst in face to face situation, we have not a problem nor do I see a problem with him talking to other racial creeds. Just makes it easier to avoid such person in future.
The same can be said on the other end of the scale, making new friends because we suddenly realise we share a common interest! Share a beer over it and viola, made a better friend.