As vividly demonstrated by the Arab Spring and Occupy Wall Street protests of 2011, the right of citizens to inhabit public spaces—what Henri Lefebvre called the “right to the city”—is one of the most crucial instruments of democracy. In both Cairo and New York, government authorities attempted to proscribe political assemblies in the name of “sanitation” and “public safety.” Likewise in both places, activists used new media tools like Facebook and Twitter to organize their activities. Picking up on the lessons and issues raised by these events, Public Space 2.0 integrates new media tools in an urban installation to create a collective debate about the regulations governing public spaces in New York. By connecting an online forum with a physical urban space, Public Space 2.0 explores how social media might support actions in physical places and vice versa, thus contributing to the reimagination of what constitutes a vital democratic public space in the twenty-first century.