The introduction of modern technologies and accompanying changes in the information environment demand a redefinition of the position of the library as a source of information in the information society of the 21st century. Information overload, information pollution and withholding of information lead to information disorder, the result of which is difficulty in searching for relevant data, difficulties in filtering and understanding of essential information, and mistrust towards public sources of information. As the users of public libraries are also affected by this, the question arises as to what is the role of public libraries in such newly created information environment, which is precisely the topic of this paper. With the aim of researching how and to what extent public libraries can contribute to the constructive informing of modern users faced with various forms of information disorder, the hypothesis on the role and position of the public library in society was examined. For this purpose, a brief chronological overview of technological changes in recent human history and the consequent changes in the distribution of information was made, the phenomenon of information disorder was explained, examples of scientific knowledge and research related to the activities of public libraries were presented, and a survey was conducted among the user population of the Zadar City Library through a survey questionnaire on a sample of 152 adults. The expected scientific contribution of this paper is in the practical application of the presented research results, which can be used to define the tasks of the public library in constructive informing of users and consequently improving the services of public libraries in the mentioned area.