I found with FB if you’re in some community that uses it then that’s it, you either use it or miss out.
For a long time my running group used it, and while it still does, the WhatsApp community is more used now. My (Catholic) church still uses Facebook for many announcements along with its own website.
You're probably being downvoted as most here are conflating WhatsApp and FB as both are owned by Meta so you're distinction is moot in the context of this discussion.
