Of what value is being on facebook if I don't want to contact relatives. I don't know anything about fb.?

I have seen on tv, that people get all upset when they have problems with others saying things about them on fb.

. They rant and rave as if it's the most disastrous thing. As I understand it, the imaginary friends are mostly people making up false identities. Could I be on facebook and pretend to be a wealthy person, who travels the world having fun? Of what value to an ordiinary person, is it, in everyday life?