Who else do you expect to have the best view on the utility of not using a Facebook account other than someone who doesn't use it?
I don't have one. I don't miss it, and am increasingly glad. But I do have the "spouse firewall"; my wife uses it and I get most of the news I need through that, and even by local standards I'm not really a social butterfly, so between the two things, my experience may not be 100% relevant. So there's my science-style "why this data point may not be relevant" disclosure.
But it certainly isn't a "requirement for modern life" or anything. The times I faintly regret maybe not having a Facebook account are separated by many months, it's not like every day I go to do something and alas, my life is degraded because I don't have a Facebook account. It's a rare event, such that I could pretty much recite to you every one from the past 5 years. (All of them are family news, either get-togethers I wouldn't have heard about, or some family news that I ultimately would have heard anyhow and didn't have any action items on either way.)
(There's enough people without a given social account that I'm still yet to encounter the site that only has Facebook authentication. I hear they exist, but they haven't naturally crossed my path yet.)
