This study analysed the usage of Web 2.0 and Library 2.0 tools by librarians in Kwara State academic libraries. A sample of 40 librarians was surveyed through total enumeration sampling technique from four different tertiary education institutions libraries in Kwara State, Nigeria. Questionnaire was used for the collection of data. The collected data was analyzed using descriptive statistics. The results demonstrate that Web 2.0 and Library 2.0 are widely used by the librarians with 80% of them currently using the tools. Various uses of Web 2.0 and Library 2.0 revealed by the study include information sharing, documents delivery, connection and networking. Major challenges to the use of Web 2.0 and Library 2.0 by the librarians are accessibility, technical-know-how and unstable power supply. Based on these findings, the study makes a number of recommendations for a more effective use of the new technology.