The use of social networks for communication purposes has many advantages that contribute to the effectiveness of communication. From connecting people outside the immediate vicinity and the possibility of expressing users' opinions through two-way communication, to removing the obstacles of lack of time and information when organizing activities and communication itself, social networks have become an integral part of all generations on a global level, and are also used for political purposes. It is evident that an increasing number of world governments are active on at least one such platform. One of the main steps in forming a strategy for communication with the public via the Internet is the selection of those social networks that the public perceives as the most credible source of information. Focusing on social networks to which users attribute the highest level of credibility would greatly contribute to increasing the efficiency of communication between political institutions and citizens and potentially increasing their popularity. In this paper, the subject of research is to determine the level of credibility that politically active Internet users attribute to certain social networks as a source of political communication of the Government of the Republic of Croatia, that is, to answer the question "Which social networks do politically active respondents consider to be the most credible source of political communication?" The research was conducted in the form of a questionnaire, and the sample consisted of 101 politically active Internet users. This research provides a better insight into the views of respondents on the degree of credibility of a particular social network as a source of communications from the Government of the Republic of Croatia and provides an answer to the question of whether the Government of the Republic of Croatia has focused its activity on the social network that the respondents consider to be the most credible source of political information.