The aim of this study was to determine associations between time spent online (in total, communicating and entertaining), support and feelings, check if there are gender differences in internet use, check the factor structure of the scales and to check if social support is the mediator in a relationship between time spent online on the one side and feelings on the other. The survey was conducted online and consisted of 447 students who study on different universities in Croatia, out of which 241 were female. Students firstly gave general information about themself and answered questions regarding the use of the internet. After that they fulfilled MSPSS scale which was used to measure social support and at the end they fulfilled SPANE scale used to measure positive and negative feelings. Support correlated negatively with negative feelings and entertainment, as well as did positive feelings with entertainment. Support showed positive associations with communication and positive feelings. The same association showed negative feelings with entertainment and total time spent online. Factor structures like the authors themselves have established, were confirmed. The correlation matrix of the used variables did not show all significant correlations so the mediation effect of the social support was checked only where all correlations between the variables necessary to check the mediation effect were significant, and those are the ones between time spent online entertaining yourself, social support and positive and negative feelings. Using structural modeling, because of the inability to predict online entertainment, based on social support, the mediation effect of social support in a relationship between positive and negative feelings and online entertainment, was not found. The characteristics of the measure of the time spent online led to low and insignificant relationships between those and other variables.