The rise of mobile food vending in US cities combines urban space and mobility with continuous online communication. Unlike traditional urban spaces that are predictable and known, contemporary vendors use information technology to generate impromptu social settings in unconventional and often underutilized spaces. This unique condition requires new methods that interpret online communication as a critical component in the production of new forms of public life. We suggest qualitative approaches combined with data-driven analyses are necessary when planning for emergent behavior. In Charlotte, NC, we investigate the daily operations, tweet content, and spatial and temporal sequencing of six vendors over an extended period of time. The study illustrates the interrelationship between data, urban space, and time and finds that a significant proportion of tweet content is used to announce vending locations in a time-based pattern and that the spatial construction of events is often independent of traditional urban form.
Nolan E. Phillips, Brian L. Levy, Robert J. Sampson, Mario L. Small & Ryan Q. Wang
The social integration of a city depends on the extent to which people from different neighborhoods have the opportunity to interact with one another, but most prior work has not developed formal ways of conceptualizing and measuring this kind of connectedness. In this article, we develop original, network-based measures of what we call “structural connectedness” based on the everyday travel of people across neighborhoods. Our principal index captures the extent to which residents in each neighborhood of a city travel to all other neighborhoods in equal proportion. Our secondary index captures the extent to which travels within a city are concentrated in a handful of receiving neighborhoods. We illustrate the value of our indices for the 50 largest American cities based on hundreds of millions of geotagged tweets over 18 months. We uncover important features of major American cities, including the extent to which their connectedness depends on a few neighborhood hubs, and the fact that in several cities, contact between some neighborhoods is all but nonexistent. We also show that cities with greater population densities, more cosmopolitanism, and less racial segregation have higher levels of structural connectedness. Our indices can be applied to data at any spatial scale, and our measures pave the way for more powerful and precise analyses of structural connectedness and its effects across a broad array of social phenomena.
Crowdmapping and geolocated protests form complex multilayered systems of communicated spaces and places that can only be partially grasped by the available literature. This article responds to these limitations by presenting a model for the analysis of the composition of space and place in networked geolocated activities. The model identifies the several forms of expression, opens four modes of analysis (representations, textures, structures, and connections), and allows the consideration of the communication devices involved, while highlighting the forms of power behind the social and cultural practices of protests and crowdmapping. The model is applied to the case of Voces25s, a protest action against the Spanish government’s austerity measures in September 2012, which relied heavily on interactive, networked maps. Furthermore, the raised sensitivity for space and place as forms of social (in)justice opens a fertile empirical research agenda in the area of the governance of communicative spaces.
