The main topic of this paper is the research of the perception on influence of television and social networks on the development of critical public opinion. It consists of a theoretical and research part. The theoretical part explains the influence of the media, the development of television as a mass media and social networks as a social form of media, the concept and importance of critical thinking development and confidence in the credibility of information transmitted by the media. Due to today's speed of transmission and availability of information, it can be assumed a significant impact of social networks on the public opinion and the development of critical public opinion. In the research part of the paper, the aim was to investigate the perception of the impact of social networks and television on public critical thinking, then to investigate the level of confidence in the information transmitted by the television and social networks and how information transmitted by television affects the formation of opinions on a topic, in regards to information that the user receives through the publications on social networks. The research was proven by the method of an online survey and the set of respondents consists of people older than 18 years. The research showed that there is a perception that social networks have a strong influence on the development of critical thinking and that information is manipulated more through social networks compared to television, although there is distrust in the credibility of information obtained by both media. It can also be concluded that there is a perception that both media have an equal influence on the creation of critical thinking.