Norton connectsafe problems with facebook

I NEVER installed Norton to my mac. I checked the downloads, I looked it up on Finder. I NEVER downloaded it. Somehow though, yesterday it started telling me Facebook is 'malicious' and blocked? We share wifi with the landlady next door, and Im not sure if she installed it or not. However, I NEVER installed any form of Norton security and now Facebook is being blocked for me.

 

I looked at the security report too and it says Facebook is totally clean!

 

It's the Norton ConnectSafe thing, and it is on and off. It'll block facebook for a while, then unblock it, then block it again. It HAD a "continue anyways" button, but now that has totally disappeared. 

 

I have no idea how to fix this and I would really like some help. Thank you.