The expansion of the Internet and the rise of digital media have transformed interpersonal communication and human and business relationships. Today, social media are popular tools for communication, sharing and expressing personal opinions and are increasingly becoming an alternative to traditional media in the process of travel planning and decision-making, enabling information to be updated almost in real time. Social media plays a significant role in travel planning and destination decision-making, not only by travelers, but also for travel companies that organize trips to various places of interest to tourists. The aim of the thesis is to analyze the concept of social networks, the development of social networks, types of social networks, the travel planning process and the connection between social networks and travel planning. The importance of travel promotion via social networks and the future of such promotion is highlighted. The research method used in this work is a survey questionnaire that was posted on the Internet. With this method, respondents' views on the impact of social networks on travel planning were obtained. The research was conducted in the period from May 7 to July 25, 2023, on a sample of 52 respondents. The largest number of respondents used social networks, and the most used were Facebook, Instagram and YouTube. Opinions on social networks are important to respondents, so the majority visited a destination that was recommended to them via social networks. In addition, they believe that travel promotion via social networks will become even more popular in the future and that communication via social networks can create a positive image for a tourist destination.