The article discusses the need to change role and functions of libraries, dictated by the challenges of the information society. In the information society, the amount of information is growing exponentially. Besides, the Internet is becoming the main space for aggregating information flows and searching for the necessary sources. In this situation, libraries are experiencing an identity crisis and, in order to maintain their fundamental role in the information system of society, they are faced with the need to change their operations. Therefore, libraries are applying information and communication technologies, especially social media, to create digital collections, to improve information services, as well as to promote libraries in order to attract users and satisfy their needs.