At some point I thought it was still a thing because my wife was still kinda, sorta, using it.

But years ago she quit.

I hear about Meta and that they own WhatsApp and I see people using WhatsApp.

But FaceBook: among my friends and family who used to post there, nobody ever posts anything. I don't doubt many are still logged in by default because they haven't updated their computer in years but they simply do not posts anything anymore, don't use if to message people (they use WhatsApp or Telegram instead) and don't check their feed.

And most of all: people don't ever talk about FaceBook at parties anymore. Since a long time. It used be a thing: people would ask if you were on FB or tell you about this or that person that posted this or that thing on FB. People don't do that anymore.

I don't understand where FB's MAU numbers do come from: in my (non tech) circle FB is simply already dead.