When is a person really "Famous"?

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I don't think "famous" is just about being well known. After living in 11 US States, 4 countries and being active in online communities for 8 years, it could be said that I'm known "worldwide"... but I'm far from famous. I can think of professionals who are well-known within their circles, but aside from their little subculture, they are all but non existant. So what is the difference between "well known" and "famous". To me it's when you have broken out of your little circle. When even those who aren't into what you do know who you are. I doubt I've ever purposely listened to more than one rap song... but I know who Eminem, Tupac and Run DMC are. I am not a sports fan, but I can recognize Tiger Woods, Michael Jordon and Nolan Ryan's faces. I don't watch Soap Operas, but can tell you that Susan Lucci starred in one for decades. To me, that's fame.