U.S. cities annually spend over $6 billion in building and maintaining public parks that afford places for social and physical activity. However, adolescent tendencies toward physical inactivity and sedentary behavior continue to increase and may be due to social and physical barriers that limit affordances to public space. The trend suggests that urban researchers should revisit adolescent place needs. Building upon the urban socio-ecological model, I suggest that social media is a social ecosystem service in adolescent placemaking. As part of the socioecology of youth, social mediaespecially video in Facebook, YouTube, Vimeo, and Instagram creates opportunities for feedback and behavioral loops that inform young people of new affordances. The urban socioecological model identifies social media as an ecological post-affordance-experience and peer support not immediately afforded by the visible, physical environment. The phenomenological study builds upon 6,686 downloaded, indexed, and coded scenes from 998 videos to identify three salient place-based categories of adolescent play behavior in five U.S. cities. The place-categories are then interpreted for urban design theory using three influential urban theorists, Bachelard, de Certeau, and Benjamin. Findings suggest that social media makes the real 'real' and provides a key mechanism to enhance adolescent affordances in public space.