We are witnessing an accelerating trend of development of digital platforms and social networks used by all generations. The consequence of rapid digital development also affects the longevity of the use of certain applications, and the providers of these applications upgrade them on a daily basis in order to adapt to the needs of users. Never before has such a large number of social networks been available through which users communicate all over the world, but also in the Republic of Croatia. The aim of the thesis is to present, analyze and interpret the impact of social networks on the generation of "Millennials". Habits, ways of communication and use of social networks by the “Millennials” generation will be investigated through a survey questionnaire based on a sample of equally represented respondents by gender and age of the said generation in the Republic of Croatia. With the accelerated digitalization and development of social networks, the way of life is also changing. What are these communication habits in the millennial generation and what is their ultimate impact on the whole generation, making everyday decisions? Millennials use technology to complete a sense of reality. This generation appreciates affordable and innovative technology that simplifies everyday life. The main determinant of millennials is that they have grown up along with technology and the internet. A study of the literature and data collected from the survey questionnaire concluded that social networks, surrounded on a daily basis by marketing ads and campaigns that determine their communication, diet, shopping and travel, heavily influence millennials. It is to be expected that with the arrival of new generations, the impact of new social networks will be greater and new generations will be increasingly dependent on them.