The aim of this study investigate to the reasons why the usage of Social Network Sites (SNS) makes users happy. To this end, the study was conducted with as a qualitative research method. The phenomenological design, which is a qualitative research method, was utilized for determining why SNS usage cause happiness and having a better to understand of how SNS users describe SNSs and what they feel about it. The study group was composed of 137 university students (60 males and 77 females) attending the Faculty of Education, Faculty of Science, Faculty of Literature, and Faculty of Economics and Administrative Sciences at a university in the southwestern of Turkey. A structured, open-ended interview was used as the data collection instrument. The contributors were asked the question "Why does SNS usage cause happiness?" and their answers were retrieved. The answers were encoded and entered to the NVivo software to conduct analyses. Based on the most frequent answers of the participants, three different experts were consulted and seven themes were created accordingly. These seven themes include Need for Stroke, Self-Concealment, Ease of Interaction, Ease of Accessing and Disseminating Information, Ease of Shopping, Leisure Activity, and Fear of Missing Out. Subcategories were also created for these seven themes. It was concluded that the theme of FoMO is nourished by all other themes.