Completely anecdotal: I have no facebook apps or social media on my android except for whatsapp, and I never use anything else from them. I see between 400 and 500 calls to graph.facebook.com _every day_

I am also using XPrivacy Lua (you need rooted phone) https://github.com/M66B/XPrivacyLua to give applications fake details like android id, gps coordinates, contacts etc.

For a nice addition, uninstall all google software and use microg instead.