How do I prevent a site from reading my identity? I just went to a site I have never been to, and it had my facebook picture and name on the page.
I visited a site I have never been to, a recipe site, to find a recipe. I was surprised to see my Facebook picture up on the page, along with a place for me to comment on Facebook about it. I provided no information to the site whatsoever. I arrived there from a link on a google page when I did a search. How can I prevent the browser from providing my personal information to sites except when I personally provide it?
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Were you logged on to Facebook at that time?
If that is the case then you probably had a Facebook cookie that was send to the Facebook site to identify you.
See also Third-party cookies and Firefox tracking protection
I never log into Facebook, but I still get websites I've never been to before slapping up a comment window with my Facebook picture and link on it. There are definitely tracking tags at work and I would much rather surf with stealth. I don't want any websites to have such a hot link to my identity - bad enough that they give me cookies and track my IP address.