This paper contrasts monologic and dialogic World Wide Web services in a library context. The first section contrasts monologic and dialogic ways of understanding human nature and the way knowledge is constructed. The second section describes the dialogic nature and potential of the Web, including intranets as dialogic spaces and the dialog between users and service providers. The third section presents three exemplary services that have succeeded to utilize this potential: a hypertext system for research documents at the Open University (United Kingdom); Sharium, a learning and research environment about the history, culture, and economic and social development of the American South, developed at the University of North Carolina at Chapel Hill; and the Finnish Public Library Frontpage, designed to help customers to satisfy their information needs and library professionals to share their expertise and keep informed about the latest happenings in the library field. The fourth section introduces the idea of the Web of Trust, a direction for the Web to develop in the future, stressing that an important factor in our decision-making is how much we trust the authenticity of the information on the Web. (Contains 18 references.) (MES)