2) Claudia Wenger : Medien Aneignung & Identität ;) -> media acquirement & identity (I could not find the propre english title now or if it exists in thai :) 2008
This one I think is really perfect for your topic: the book really talks about media-idols and ideals, media-star, media-idols for young people :), interviews with people 13-18 years old. I think it talks more about the consumers of this kind of bloggs than of the authors.
-> A I just found out that the author of the book is a media-artist.! :)