There is something else going on around FB. Almost all activity online has shifted away from the Social Graph to a Content Graph. Almost nobody wants to see what their friends are doing online anymore. In a lot of ways it can be cringey. People just want the latest, catchiest content. TikTok and Youtube are the OGs here, but it's everywhere when you start to look. Twitter timeline changes being an awkward but working…
Perhaps I'm just an outlier, but it's the same with Twitter for me. I use it more these days than I did some years ago, but I also use it mostly like an RSS feed. I follow video game devs, musicians, etc. so I can be kept in the loop on the latest releases and whatnot.
I think you make a good point about content graph. I think there is some truth to that, although I have never really taken any interest in anything but the kind of content that YouTube offers.