Getting rid of facebook notifications on desktop

In an iMessage, a friend sent me a link to a facebook page. I was on my macbook air. This was a mobile facebook page link. I clicked it, not realizing. It opened into a browser in google chrome, and something popped up asking me if I wanted notifications. I clicked yes, just wanting the pop-up to go away (... bad choice.)

Now, I get facebook notifications popping up on my desktop in the right hand corner all the time.

HOWEVER, in my system preferences > internet accounts, I am not signed in on facebook, and never have been.

In my system preferences > notifications, a facebook icon does not exist. I never have had it there.

Yet the pop-ups keep coming up. I have not found a solution on how to get rid of these yet. Someone please help!