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Recent years have seen a resurgence of interest in the relation between networks and spatial context. This review examines critically a selection of the literature on how physical space affects the formation of social ties. Different aspects of this question have been a feature in network analysis, neighborhood research, geography, organizational science, architecture and design, and urban planning. Focusing primarily on work at the meso- and microlevels of analysis, we pay special attention to studies examining spatial processes in neighborhood and organizational contexts. We argue that spatial context plays a role in the formation of social ties through at least three mechanisms, spatial propinquity, spatial composition, and spatial configuration; that fully capturing the role of spatial context will require multiple disciplinary perspectives and both qualitative and quantitative research; and that both methodological and conceptual questions central to the role of space in networks remain to be answered. We conclude by identifying major challenges in this work and proposing areas for future research.

Concerns have been expressed that Internet use may affect social participation and involvement in the local community. Internet use can be viewed as a time-consuming activity, and it may come at the expense of face-to-face activities. The time people devote to using the Internet might replace time spent on neighborly relations and community involvement. However, the use of computer-mediated communication in geographically-based communities might also increase face-to-face communication and even solve some of the problems associated with decreasing participation and involvement in the local community. The purpose of this study was to explore the relationship between membership in a geographically-based mailing list and locally based social ties. A web-based survey of subscribers to two suburban mailing lists in Israel was conducted to investigate the relationship between membership in a mailing list and neighborhood social ties, social ties in the extended community, and the movement from online to face-to-face relationships. It was found that although membership on the mailing list did not affect the extent of neighborhood interactions, it increased the number of individuals a participant knew in the community. Online relationships with members of the local community proved likely to change into face-to-face relationships. The results imply that community networking increases social involvement and participation not in the immediate neighborhood but in the extended community and serves to complement traditional channels of communication.

Research suggests that the formation of neighborhood social ties (NSTs) may substantially depend on the informal social contact which occurs in neighbor- hood common spaces, and that in inner-city neighborhoods where common spaces are often barren no-man's lands, the presence of trees and grass supports common space use and informal social contact among neighbors. We found that for 145 urban public housing residents randomly assigned to 18 architec- turally identical buildings, levels of vegetation in common spaces predict both use of common spaces and NSTs; further, use of common spaces mediated the relationship between vegetation and NSTS. In addition, vegetation and NSTs were significantly related to residents' senses of safety and adjustment. These findings suggest that the use and characteristics of common spaces may play a vital role in the natural growth of community, and that improving com- mon spaces may be an especially productive focus for community organizing efforts in inner-city neighborhoods.

This study investigated influences of residential street layout on neighboring. The study design was quasi-experimental with one pretest and two posttest measurements in an intervention group and two control groups. Data were collected using a recently developed questionnaire (MMN) and through field observations. The intervention implemented in this study was a transformation of three sections of residential streets into street parks, entailing considerable changes in street floor and spatial layout, provisions of street furniture like benches, planting of trees and flower beds, installation of play equipment, and prohibition of traffic and parked vehicles. Supportive acts of neighboring, neighbor annoyance, and children's play showed an overall increase in the intervention streets, interpreted as a sign of increased involvement in the neighborhood. Weak social ties and neighborhood attachment showed more complex patterns of changes, depending on demographic factors. It is suggested that symbolic effects of the changes may be more significant than functional effects, and thus that a change of neighborhood identity is an important mechanism.

To what extent does the density of the tree cover in a city relate to the amount of social capital among neighbors? To address this question, we linked social survey data (N = 361) from the Baltimore Ecosystem Study with socioeconomic, urban form, and green space data at the census block group level using a geographic information system. We found a systematically positive relationship between the density of urban tree canopy at the neighborhood block group level and the amount of social capital at the individual level (r = .241, p < .01). Multiple regression analyses showed that tree canopy added a 22.72% increase in explanatory power to the model for social capital. This research adds a new variable—neighborhood tree canopy—to the typologies of green space that affect human social connection. Trees are a relatively inexpensive and easy intervention to enhance the strength of social ties among neighbors.

This study assessed the factors that shaped the development of shared trust, norms, reciprocity (TNR), and social ties—important foundations of social capital—for low-income HOPE VI (Housing Opportunities for People Everywhere) residents who relocated to new communities. A longitudinal mixed-methods approach revealed the distinct but understudied role that neighborhood institutions, facilities, and public spaces play in shaping observations, encounters, and interactions with other coresidents (as well as outsiders). Multivariate analyses of survey data indicate that neighborhood facilities and public spaces, such as parks, libraries, and recreation facilities, were very strong predictors of TNR among neighbors. Indepth interviews with relocated women revealed the ways in which neighborhood structure and public spaces can shape social encounters and relations in the neighborhood. This article presents a discussion of the ways in which these important but often overlooked neighborhood attributes can structure contact with neighbors and considers implications for policies aimed at improving low-income peoples access to social capital through relocation.