make safari forget facebook credentials

Hi!

I don't know if it is related but I had in the past installed the facebook app on my iphone but deleted it 8 months ago. As far as I am aware I have never logged in to facebook in the safari app on my iphone. (I only use my PC laptop now to login to facebook.)

I have no passwords saved on my iphone at all.

But still from time to time when clicking on a search result in Google in the Safari app on my iPhone that takes me to a webpage on facebook, it is logging in to my account. How can I make Safari/iPhone or whatever it is that remembers my credentials to forget me?

Or is this a question for Facebook? Can they remember the device I have used and log me in without my consent?