I have a fake facebook account?

that is not associated with my name or real email address at all. I have no friends on there and all info is blocked. I only use it on rare occasion just to check non-friends pages. Nobody knows i have this page but me. Is there any possible way someone would figure it out? Can you really see who is checking out your profiles? I thought those sites were all bogus and gave fb viruses. Somebody asked me if I was "the alias name" i use and it totally blew my mind! How could they know?? I acted like I had no clue what they were talking about. Could they really find that info out and if so how???