This paper offers a systematic overview of the aspects of Heidegger’s Being and Time that are concerned with the understanding of human sociality. Three dimensions of Heidegger’s analysis are distinguished: self-being (Selbstsein), caring-with (Mitsorge), and being-with-one-another (Miteinandersein). These dimensions can be enacted in different modalities on the spectrum of unwontedness (Uneigentlichkeit) and ownedness (Eigentlichkeit). To keep matters simple, I focus on the unowned and owned extremes, distinguishing anyone-self (Man-Selbst) and owned self (eigentliches Selbst), leaping in (einspringend) and leaping ahead (vorspringend) solicitude (Fürsorge), as well as the anyone (Man) and a people (Volk). My discussion of these key terms of the analysis in Being and Time focuses on investigating Kierkegaard’s role in the development of Heidegger’s thought.