Howdy all. Just read this and I think it has some good info on how to stop being listed on FB as a member of a group if you dont want to. This is not a discussion on whether you care if people know or not but on whether you let FB do it for you. "Even if you are logged out, Facebook still knows and can track every page you visit," Cubrilovic wrote in a blog post.
"The only solution is to delete every Facebook cookie in your browser, or to use a separate browser for Facebook interactions."
Cheers
Zee