> Personally I've decided that it's more important to me to have a few dozen really good friends in my life, instead of hundreds of people that passively take part in my life

That's a false choice, though; while I don't use FB, everyone I know who does still keep a few good friends that they meet and talk to regularly. You and I could be scrolling our FB feeds right now, instead of reading HN, without taking time from our existing friendships.