The usability of the Internet increases for every year. The Weblog phenomenon makes it possible for anyone to easily publish, find information and get in touch with other people through the net. This Essay treats the possibilities the Weblog medium offer Swedish libraries and librarians in library contexts. The purpose of the study is to examine the Web phenomenon: Weblogs, and their significance for a total of eleven Library Heads and librarians together with their view on the Weblog activity at each library connected Weblog, to get comprehension and new knowledge on the usability of Weblogs in the library sector. The foundation for the Essay consists of a qualitative interview study, built on asynchronous e-mail interviews and telephone interviews with blogging librarians and Heads of libraries. Theoretical frames and concepts are taken from Internet Research Theory, Socio-cultural Theory and Theory of Library- and Information Science. From the result and analysis can be found that Weblogs serves a purpose as virtual arenas, where people can meet, communicate, discuss and exchange information along with networking. The Weblog is a complement to other information channels as for example Web, e-mail and intranet. Weblogs are used for the purposes of communication and information, for marketing and for pedagogical activities. My conclusion is that for libraries and librarians the Weblog activity means a new way of communication and dialog with the surrounding world. The Library Sector can make its activities come into sight and the librarians can inform and communicate with colleagues and users.