The theoretical part in this paper explores the growth and connection between narcissism and the popularity of social networks, especially Instagram, the fastest growing social network in the world. The second chapter analyzes the notion and aspects of personality, and in the third, narcissism as a state of self-infatuation, where it is found that persons suffering from the disorder are characterized by a grandiose view of themselves, a lack of empathy, as well as a constant need for attention. Narcissistic personality disorder existed long before Instagram and social networks, but omnipresent media today is encouraging such behavior. Chapters 4 and 5 show how in the 21st century a person does not seem to exist if he or she is not present on social networks. They influence the formation of individuals' attitudes and opinions and promote unrealizable idealized beauty standards. There is a need to stand out just to get as many views as possible, and Instagram gives average people the opportunity to achieve just that, by directing their virtual lives by themselves. It allows everyone to look better, younger and more attractive than in reality. Narcissus, whose characteristic is grandiose self-representation, finds it extremely important to look perfect on his or her’s social media photographs and they tend to do their best to bring the photos to perfection, even by digitally modifying their bodies in the hope of concealing her imperfections. In the research conducted, using the Narcissistic Personality Inventory, it was examined whether the overwhelming number of Instagram users possess the characteristics of a typical narcissistic personality disorder. The results confirmed three of the five hypotheses. It has been found that female Instagram users post more photos of themselves than men do, and that most Instagram users find narcissistic behavior visible on this social network. There was also a significant positive association between time spent on Instagram and narcissistic behavior. A stronger correlation between the intensity of Instagram use and narcissism has not been confirmed, nor has the hypothesis of consciously posting its own distorted reality.