Top interests/themes for teenagers 12-1?

[K0p4c]

What are some topics or interests that would easily target teens ages 12-18?

This is a for a website and I need a base to start it from such as swatcash.com who had the theme of battle and there were many user options to go along with that theme. What would grab the attention and be fun/interesting for this age group?

 

[Youtellmet:]

Im 13, and basically me and my friends talk about:
School.
Fashion.
Gossip.
Celebrities.
Music.
Movies.
Boys.
Teachers.
Jokes.
Food.
Facebook.
Shopping.
Family.
Texting/Any type of technology.

And thats about all I can think of. Hope i helped