I'm a member of various groups on FB, Kon Mari, Animal Rights groups, Veggie/Vegan local groups and it's easier than signing up, just via my email. It means that things are there forever, as well, without me having to 'manage' them.
I'd miss out on loads of local events, there's one person, in particular, who knows everything that's going on, especially free/cheap stuff, that I can take my GC, to (she's a LP of four).
I'm not passing local shops, so I don't see posters for 'fun days' etc. I've found sewing/baking classes, through FB.
I don't 'Check in', or post about what I'm doing. I've got pictures of my pets or my GC, that usually my DDs have, anyway. One of my DDs doesn't back her phone up and would have lost pictures, if she hadn't have put them on FB.
FB doesn't have to be a documentary about your life. You can use it as an email account.