I get so much pleasure out of Facebook that there's no way I'd ever be scared into quitting it. My FB friends are family, in-laws, friends I know IRL - in real life - or friends I've known online for years and trust. I've found old friends and in-laws I'd lost touch with years ago. I have friends in the US, UK, Ireland, Uganda, Australia.
I joined FB in 2008 while living in Uganda. When my grand-niece was being born the following year my SIL in the US and I were in the virtual waiting room keeping up with the progress through FB. My nephew posted photos of his new daughter on FB just after she was born. I highly doubt he'd have bothered to attach and email these photos to all his family and friends.
My FB friends range in age from my 16 year old niece, to my brother's 80+ year old mother in law.