There is a special issue on Network-Behavior Dynamics in the Journal of Research on Adolescence (Volume 23, Issue 3, September, 2013). It discusses the effects of social networks on adolescent behaviors, referring to selection and socialiazation effects. Here is the direct link it: http://onlinelibrary.wiley.com/doi/10.1111/jora.2013.23.issue-3/issuetoc
I send you the file of the paper that we have published, titled "Social Network's Effects on Italian Teenager's Life" and that contains a study related with adoleshent in Italy.