Fear of Missing Out (FOMO) is one of the phenomena driving Generation Z's participation in social media,
particularly in the S Line Trend on TikTok. This trend is sensitive and contrary to norms, thus causing
controversy. Using a descriptive qualitative approach based on the Fear of Missing Out (FOMO) theory, this
study aims to analyze how FOMO drives Generation Z's participation in the S Line Trend on TikTok, identify
the factors that cause FOMO, and identify its impact on moral values and digital behavior. Primary
data were obtained through interviews with eight Generation Z TikTok users aged 19–28 who followed the S
Line Trend, while secondary data were obtained through observation of S Line Trend content on TikTok and
documentation. The results show that Generation Z's experience of FOMO manifests itself in the form of fear
of being left behind, concern about social judgment, and anxiety about remaining relevant in their social
circle. Exposure to the TikTok algorithm, coupled with entertainment motives, social pressure in social
circles, and the need for validation and self-existence, are the contributing factors. This superficial
participation has the effect of creating negative perceptions from the surrounding environment, which makes
Generation Z more cautious in following trends. FOMO not only acts as a motivator but also shapes the
consequences, so Generation Z needs to be more critical in using social media.
Keywords: Digital Ethics, Fear of Missing Out, Generation Z, S Line, Trends