Most definitely not true. My girlfriend doesn't even show up on that list as of now. Someone I never talk to is also on it, my ex-girlfriends aunt, and Nicky Keefer. Unless my profile is just that interesting and I'm unaware, your friends theory is false. Pretty sure it's entirely random. Or perhaps it is a mix of profiles that Facebook thinks you would find interesting and pages that you visit often. I don't know.