I used FB back in high school/college when it was more pure and meant to keep you in touch with friends and family.
Lately, FB has become, in my opinion, a shrine to the self where we are inundated with silly things like what someone ate for dinner (often with pictures), the precise timing someone's baby said the word "mama," political causes, etc. As such, it also represents a barrier to maintaining privacy. Sometimes, I take silly pictures with friends where things may not be completely appropriate at least in the eyes of potential superiors/employers, so I also don't want to worry about putting myself in a position where something I post (or someone tags me in) can be used to form an opinion of me and potentially hurt me in the "real world."
I call my friends and family. I snap chat sometimes too. I just don't have a real use for FB anymore, and after weighing the pro's and con's decided years ago to do away with it all together.