Fcb for me it's ads, ads ads and even more ads. The newsfeed is complete slop from news outlets. It's just extremely noisy. The only thing that I use there is the Messenger because my older friends aren't too savvy with Whatsapp.
And even the Messenger app is a sloppy behemoth of an app with barely working Search. This is coming from a company with thousands of engineers and the core features of the business barely work.
98% of newsfeed is recommendation slop.