My local consulate (I’m an immigrant/ex-pat/whatever) uses FB for all announcements and Messenger is _the_ communication channel. If you need to talk to them, you need to either go personally (3h drive for me each way plus waiting lines) or you send them a message on FB. They usually reply within 5-10 minutes.

Many small businesses also seem to depend on FB for communication.

I can avoid the latter, but my consulate is why I can’t delete my FB account.