No need. It's "online" so it isn't installed on your computer. You "remove" it by no longer visiting it.
How Do I Remove Facebook From My Computer?
I don't use facebook myself because when I tried it wold not allow me to use any password that I tried for ages then I was finally able to use one but have forgotten it as I never use facebook. I let a friend use my laptop while their computer wasnt working and they put their facebook account on it without asking but Will not give me their password so I can remove it.is there a way I can remove it permanently without using a password