Yes. https://devices.ubuntu-touch.io/device/fp4/release/focal
Get a Pinephone, or a Fairphone with Ubuntu. More privacy and more features than dumb phones.
SlimSocial for Facebook works, it’s just slow.
I use this and you can preemptively create some groups you can share your location to, then turn those on. If this works for you.
Yes. https://devices.ubuntu-touch.io/device/fp4/release/focal