Relations between the use of social media, problematic use of the Internet, types of loneliness, the tendency to compare with others and the fear of missing out among students The use of the Internet and social media is nowadays a need and using them daily is a habit for many, and young people stand out the most in the amount of time spent on various Internet platforms. Certain behaviors and ways of perceiving oneself and others can cause individuals to show a greater need to spend time in the online world, which can result in problematic use of the Internet and social networks. The main objective of this study was to examine the relationship between social media use, generalized problematic Internet use, types of loneliness, tendency to compare with others, and fear of missing out on the student population. The study involved 205 Croatian students aged 18-22 and was conducted through an online questionnaire containing the following scales: The Generalized Problematic Internet Use Scale 2, adapted version of Iowa-Netherlands Comparison Orientation Measure, Fear of missing out scale, Social and Emotional Loneliness Scale. Students mostly stated that they use social networks 2-3 hours a day, most often to communicate with close people, out of boredom and to search for certain information. The obtained results indicate the existence of a statistically significant positive correlation between the social media usage with problematic Internet use and fear of missing out, as well as problematic Internet use with a tendency to compare with others, fear of missing out and emotional and social loneliness. Hierarchical regression found that problematic Internet use and fear of missing out were statistically significant positive predictors of the social media usage. Also, it was found that the social media usage, the tendency to compare with others, fear of missing out and romantic loneliness as component of emotional loneliness are positive and statistically significant predictors of problematic Internet use.