Hipster, Indie, Tumblr- creative kids who think outside of the box. They are into indie rock and think they are witty. I didn't know Tumblr could be an adjective. You learn something new every day.
Emo- Wear lots of black, grey and maybe a touch of red. They rarely smile and seems depressed all the time. Music of choice is scary. Ok so these aren't really new.....but still worth mentioning.
Scene Kids- Lots of animal print usually zebra, Neon colors paired with black and their hair is multi colored. I think they are Emo that aren't afraid of color.
Preps- They wear brand name, drive brand name and talk brand name. Think Mean Girls. At one time I would have classed these as popular kids but apparently they are even more selective than just being popular.
So there you go. If you ever find yourself back in middle school or high school you won't get punched in the face for referring to a Scene kid as Emo, or calling a prep a gamer. You can thank me as you avoid being shoved in a trash can. :)