Purpose - This study aims to explore the extent of Web 2.0 adoption by libraries of top universities in Africa. It focuses on identifying the extent of utilization, types of Web 2.0 technologies adopted and how these technologies are used. Design/methodology/approach - The content analysis method was used. Data was collected by analyzing library websites of 82 top universities in Sub-Saharan Africa. Also, a combination of literature review and document analysis was applied. Findings - About half of the libraries in the study adopted one or more Web 2.0 applications. Social networks were the most widely adopted while social bookmarking and tagging were the least used applications. Web 2.0 utilization in African academic libraries was still in early stages. Research limitations/implications - This study is mainly based on analysis of library websites. Web 2.0 platforms that were password protected and accessible through intranet were not studied. Therefore, studies that are based on feedback of librarians and patrons are warranted to further investigate Web 2.0 utilization in African libraries. Practical implications - Web 2.0 plays a key role in facilitating information sharing, collaboration, and communication between librarians and patrons, and among librarians. It is essential for African libraries to integrate these technologies into library services to enhance the quality of services. Originality/value - This is likely the first study about Web 2.0 applications in African academic libraries. It is a useful source for implementing web-based technologies in libraries.