I think there are 2 different levels of anime fans.
Level 1: People like me, you have your designated favorite shows that you MUST watch/read every new episode and manga that comes out and you enjoy it very much. You like to be in communitys based on that anime you enjoy. You'll have sigs, avatars, and wallpapers about it on your desktop and you will talk about it alot. (this can be your everyday normal joe, or someone borderlining geekness)
Then there is level 2
Level 2: You cosplay the anime, you try to revolve your life around the anime and try to live out episodes of it in real life. You dress in clothes similar to your favorite character, you base your personality on them to. You fantasize about the characters, and you find cartoon characters attractive, you have fantasys about them, you look at hentai about them. Basically you find the anime a better life then reality, and you are overly attracted to fictional characters. (This is a geek/nerd)
Simply put, I am a Level 1 anime fan.
w00t go Naruto, #1 anime EVER!