That's why I use NetGuard (Android app) as a personal firewall on mobile and block facebook on home router etc.
what are FB libraries?
I dont have the FaceBook app on my fresh Android phone. There's still the com.facebook.katakana service running, which I explicitly blocked via NetGuard. But they are still the tracking pixels and cookies remaining, via all the webpages with their Like button integration, and Google/Mozilla conspired to block browser extensions to disable those.