Over the past decade a new set of spatial and locative technologies have been rolled out, including online, interactive mapping tools with accompanying application programming interfaces (APIs), interactive virtual globes, user-generated spatial databases and mapping systems, locative media, urban dashboards and citizen reporting geo-systems; and geodesign and architectural and planning tools. In addition, social media produces spatial (meta)data that can be analysed geographically. These technologies, their practices, and the effects they engender have been referred to in a number of ways, including the geoweb, neogeography, volunteered geographic information (VGI), and locative media, which collectively constitute spatial media. This chapter untangles and defines these terms before setting out the transformative effects of spatial media with respect to some fundamental geographic and social concepts: spatial data/information; mapping; space and spatiality; mobility, spatial practices and spatial imaginaries; and knowledge politics. We conclude by setting out some questions for further consideration.