I really don't think this is true anymore at least in my generation. I'm in my late 20s and my family and friends really don't seem to post much content anymore on social media after graduating college. It's pretty much for consumption of memes and other internet content and could be cut out easily since its a time sink, vs years ago when people were much more active and no one ever followed commercial accounts or people they didn't personally know. These days I just call and text people, way less friction and I have everyone's number I care about.