Most U.S. teenagers participate in online social network sites, devoting hours to these networks, often at the expense of other leisure-time activities. This article describes young people's activities within one topic-focused niche network, outlining its unique features and the role of young people as content producers within and beyond the space. Links between youth's online contributions and their interest, self-expression, social connections, and civic involvement are discussed. (Contains 1 figure and 9 notes.)