I thought long, and hard about joining FB a number of years ago when friends, and associates approached me to join.
Still thinking about it.
Don’t.
It will suck you in and waste your time; your privacy will cease to exist. And that was true back when FB was still unknown. To paraphrase an overused cliche - What goes on Facebook, stays on FB. Even after you 'quit'.
Stay out of Facebook.
DON’T once you put your data in, you are in forever
You can De-activate your account but it doesn’t go away and it really sucks