This poster is part of a larger project which examines how the Internet is influencing transmedia cultural products created for teens, and challenging the traditional role of librarians as arbiters of taste within the realm of young adult (YA) literature. The overall research focuses on four case studies that explore the effect of the Internet on YA literature and how it is created, evaluated, and read. Results from one such case study, based on books in Stephenie Meyer's bestselling Twilight series , are presented here. Fan activity around Twilight demonstrates how teens create user-generated content which publishers are able to transform into powerful, socially-networked marketing material which is created and disseminated by the users themselves. This in turn causes a disintermediated relationship between publishers and their teen consumers, and as a result, raises important questions about what happens to YA librarians' conventional role as taste-makers in the field, and about the types of YA books that will be published in the future.