I recently conducted a review to see if there is any scientific evidence for the claim that Internet use is affecting the brains of adolescents. This is an ongoing effort, and if you know of any studies that might be able to shed light on this topic, please get in touch.
Review results ( all comments welcome; CC BY-NC-SA )
Boing Boing article ( note: I do not stand behind the title and have asked them to change it! )
2014 SXSW Interactive Festival presentation ( CC BY-NC-SA )