A new book:  Social media of networked teens
( USA)
Read here
Author: Danah Boyd. 
Clicking in the author’s name you can explore the webpage of the book and there is a link to her web page
An interesting table of content:

1. identity why do teens seem strange online?
2. privacy why do youth share so publicly?
3. addiction what makes teens obsessed with social media?
4. danger are sexual predators lurking everywhere?
5. bullying is social media amplifying meanness and cruelty?
6. inequality can social media resolve social divisions?
7. literacy are today’s youth digital natives?
8. searching for a public of their own