Facebook socialising is a lot less direct than an email. I see Instagram photos and the like from friends and enjoy it but if they all emailed those photos to me every day I’d feel overwhelmed by the experience. In any case, they wouldn’t do that anyway, because they’re already posting to Instagram because that’s where all their other friends are.

Yeah, I'd do that as well. I've seen others do it.

But people might not see your "hey, leaving FB post." They might not check FB often. Or it just kind of gets buried. etc.

Phone numbers and emails change, though. "Contact rot" happens. So, I don't know. I guess I like to have multiple ways to contact people.

This is all predicated on the fact that FB is absolutely not a distraction to me. I look at it maybe once or twice a month. I have all notifications turned off. So, it is not a drain on my (fragile) attention span.

Maybe most importantly, a lot of the folks I keep up with on FB aren't necessarily people I talk to directly. We would not really be keeping up by email/phone/letter/whatever. Some people see that as evidence that, hey, those are obviously people you don't need in your life. Perhaps that's true for some. For me, I enjoy having acquaintances as well as friends.