I have friends and family, and groups in which I discuss highly specific topics. I don't think there's a better tool than Facebook that allows me to stay up to date on things that are important to me. The equivalent subreddits are of much worse quality. I know this will get downvotes, but this is my opinion.
Discord has taken over this role for me and all my social groups. And unlike Facebook there's no ads, no viral bullshit, no astroturfers, no personal information, and you can keep your identities separate across multiple social circles (all of which are private and invite-only by default).
They still retain all of your messages (including DMs) unencrypted indefinitely with no easy way to remove them. Deleting your account doesn't remove messages either.