I want to stop Facebook appearing on PC but still receiving FB on my iPhone?

Facebook is received on my iPhone as well as PC. I don't need it on PC, as I have already read it on iPhone. Doubling up not needed

So, just close facebook on your internet browser…

Log out, clear all fb related things on the computer. Log back in only on phone and go in settings to fix which notifications you want to get. If you use the app you'll have to sign in on the regular site on mobile and comp i believe.