Web 2.0 represents an emerging suite of applications that hold immense potential in enriching
communication, enabling collaboration and fostering innovation. However, little work has been done
hitherto to research Web 2.0 applications in library websites. This paper addresses the following three
research questions: (a) To what extent are Web 2.0 applications prevalent in libraries?; (b) In what ways
have Web 2.0 applications been used in libraries?; and (c) Does the presence of Web 2.0 applications
enhance the quality of library websites? Divided equally between public and academic, 120 libraries'
websites from North America, Europe and Asia were sampled and analyzed using a three-step content
analysis method. The findings suggest that the order of popularity of Web 2.0 applications implemented in
libraries is: blogs, RSS, instant messaging, social networking services, wikis, and social tagging applications.
Also, libraries have recognized how different Web 2.0 applications can be used complementarily to increase
the level of user engagement. Finally, the presence of Web 2.0 applications was found to be associated with
the overall quality, and in particular, service quality of library websites. This paper concludes by highlighting
implications for both librarians and scholars interested to delve deeper into the implementation of Web 2.0
applications.