The aim of this thesis is to investigate how libraries use the tools and ideas from library 2.0 in their reading promotion work. We also want to include how librarians motivate this use and whatever merits and faults they encounter. We have performed document studies and interviews which we then analyzed with qualitative content analysis. Our theoretic framework in this study which we also used as a part of our coding scheme in the analysis was a model over the concept library 2.0 developed by Holmberg, Huvila, Kronquist-Berg and Widén-Wulff. This model describes seven aspects of library 2.0 which is users, participation, library and library service, web and web 2.0, social aspects, technology and interactivity. We can see that there is a multitude of tools that can be connected to library 2.0 and reading promotion being used by the libraries we investigated. The library tools we found most relevant for our study where blogs, user advice, catalogue and chat. Even if the libraries could offer these tools there were widespread issues with low user participation. We think this may remove the possibilities for the tools. The web sites with high user participation had a strong focus on the social aspect among the users and librarians. We think this may be of importance but require further research.