Mobile geotagging services offer people new ways to interact with and through urban space. In this paper, we focus on a mobile geotagging service called Socialight and the social practices associated with it. In-depth interviews and participant observation were conducted in order to explore how Socialight's virtual “sticky notes” were used in everyday life. Findings indicated how users communicate about place to help build social familiarity with urban places and communicate through place to allow users to create place-based narratives and engage in identity management. Such findings deepen our understanding of the social production of space and have implications for future location-based mobile services.