I dunno, I've been hearing for years that no one uses Facebook anymore, or it's just Boomers, but that's not how it is in my area. Most of the small businesses use it as their main presence online, because it's so easy to toss up a post about a new product or sale or a picture of their new menu. All the small towns have active FB groups where people share community activities and help each other find lost pets and such. My own family uses FB messenger to plan events and keep each other informed about things, which is the only reason I still use it.

Maybe it's regional and I just happen to be in a FB-heavy region, or it's dying in the cities but still useful in small towns and rural areas, but it's doing fine here.

IME, it's that no one posts to their profile anymore. It's either read-only or posting to groups.

That's true, not many use it the way it used to be used. If I go to my friends' timelines, most are empty for months/years at a time, except for a few who post several times a day, apparently craving attention.

Yeah, I check in once in a while to see if my elderly relatives are still posting and that's it.