I like tumblr, anime and alt rock and I'm pretty sure I'm doing this "teenager" thing completely wrong.
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Bands: 30STM, MCR, Kill Hannah, The Killers, Flyleaf, Muse, Placebo, AFI, Metric, The Used, Marina & The Diamonds, Birthday Massacre, etc. 
Books: Colonel Sassacre's Daunting Text of Magical Frivolity and Practical Japery (I hope at least one of you gets that reference omfg), Rockaholic (C.J. Skuse), Fallen (Lauren Kate), Eggs (Jerry Spinelli), I'd Tell You I Love You, But Then I'd Have To Kill You (Ally Carter), etc. 
Movies: V For Vendetta, Howl's Moving Castle, anything relating to Tim Burton or superheroes
Videogames: Final Fantasy XIII/XIII-2, Kingdom Hearts, Jak and Daxter, Asassin's Creed, Pokemon, etc.
Anime/Manga: Death Note, Black Butler, Soul Eater, Ouran High School Host Club, Shugo Chara!, Lucky Star, Teen Spirit, D. Gray-man