Why haven't anyone named the furry fandom? I'm a proud supporter; we are not as weird as the media wants you to think.. There is also a Panic! At The Disco fandom, but we kinda hide in our own corner. We were also much more popular during when the original band was together (2004-2009?) too. Don't forget the Taylor Swift, Twilight, and the Sonic fandom.... There is also a Legend of the Guardians fandom, that hides in it's own corner too. And there could be some American Idol fandom flying somewhere, same goes with X Factor.
Some more could be..
Bands:
Paramore
Blood on the Dance Floor (my friends like them a lot)
The Beatles
Games:
Halo
Call Of Duty
Mario
Kirby
Spyro
Movies:
Disney
Books:
Warrior Cats
Percy Jackson
Redwall
The Hunger Games (popular among some of the energetic boys in my grade)