The purpose of this study is to analyze how the blog as an arena is being used by young people to discuss and reflect on reading and literature, and what purpose the blog as an arena has for them in the forming of identity. The method used in this study is qualitative content analysis. Prior research is divided into two themes: young people’s reading, and young people in group constellations in and outside of the blogosphere. The theoretical framework is made up of Louise M. Rosenblatt's theory on reading Etienne Wenger's theory on communities of practice. The analysis is based on book blogs by young people on literature and their literary experiences in the blog, and how the blog works as an arena in their identity formation. The results show that blogs and social interaction within them give young people perspectives on their own personality as readers and on their own lives. As book bloggers, the members become part of a whole, a defined group. The reading of fiction and blog-based writing and reading works to include them in a group and gives young people an opportunity to develop and identify themselves both as readers, "booknerds" and as book bloggers.