This paper is an attempt to find out the ways to enhance the sustainability of libraries in the environment of the latest technologies, various challenges, and the role of social media marketing as a possible solution. The sustainability of libraries is directly influenced by the adoption and promotion of advanced technologies, the concept of a participatory library, the perceptions of the stakeholders, and challenges by modern trends and technologies. Major challenges are resistance to change, diversity in information resources, and dynamic user behavior. The paper focus on how social media marketing helps libraries in catering these challenges by influencing the perceptions of library patrons and policymakers and administrators. It also enhances the library’s image and value through better librarian-user interaction and user engagement.