http://digitalyouth.ischool.berkeley.edu/
Another resource for me is this site. Ok, you will probably think that if we talk about Berkeley University, it can get complicated. Actually, it has micro-researches about uses of digital technologies in youth culture in a very accessible manner. Online subcultures, self expression, informal learning and game culture or family, community and Youtube are just a few themes of these micro-researches. Here, you can find out about teens and their different use of the same media (ex: MySpace) and also, little debates and theories tested and confronted with the field.
Ethnographic knowledge is the key word and it is showed in a easy and accessible, but not without depth, manner.

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