I wonder if there is sort of the uncool factor going on. People might "use" FB but it's not cool to post very often or admit to it. 1.56B DAUs, that's 20% of the planet, if you include whatsapp, I think it's staggeringly more. Either they are somehow lying about their numbers and risking potential shareholder lawsuits or it is like shopping at Walmart or eating at McDonald's where the "cool kids" never admit to it but very clearly a good sized chunk of them still do. Lying about the numbers just seems sort of silly to me.

It's odd, none of my same age friends post much on FB; it's vacation brag pictures, various life events or children's milestones sort of stuff. At the same time, messenger might be the best way to contact many of them, better than SMS.