Since their emergence in the early 2000s, social media have continued to increase in popularity, particularly among adolescents and young adults. Even though they have been studied in relation to a wide range of topics, including their role in politics, social relationships, activism, identity construction, and youth cultures, the rise of social media is also connected to a number of less dramatic, yet pervasive, shifts relating to their integration into the mundane practices of day-to-day life. In this article, we explore the uses of social media as part of everyday life, a perspective that has gained less attention in research about social media. We take an interest in how young adults create meaning around their daily practices, involving many different social media platforms. Doing so, we draw on in-depth individual and small group interviews with 67 young adults, aged 18–26, conducted in Sweden during 2019–2021. We approach social media as a joint environment, consisting of a wide range of different platforms traversed by the user. The empirical analysis identifies three significant meanings of social media: filling empty slots, everyday transformations, and mood management. These three different meanings are shaped by different temporal, spatial, and technological characteristics and emphasize the importance of social media use in the lives of the young adults.