In 2013-2014, I conducted a review to see if there is any scientific evidence for the claim that Internet use is affecting the brains of adolescents. In 2015-2016 I conducted another review discussing the evidence for Internet use affecting cognitive development during adolescence. These are both ongoing efforts, and if you know of any studies that might be able to shed light on this topic, please get in touch.
Cognitive development (2016):
Paper to be published April 2016 in Media and Communication.
Brain development (2014):
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 )