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Cet article examine comment la structure des reseaux personnels (ou Bgocentriques) est liBe a la participation continue des individus dans un mouvement social (le British Columbia Wilderness Preservation Movement). Les resultats presentes dans ce texte suggerent que la communication, le recrutement continu et l'identification influent sur le rapport entre la structure des reseaux et le niveau de participation dans le mouvement. Differents aspects de la structure du reseau personnel ont diffbrents effets sur ces processus de mediation. Finalement, dans le contexte d'un activisme comportant des risqueslcofits faibles ou moyens, les liens faibles sont plus importants pour faciliter la participation que ne le sont les liens forts.This article examines how the structure of egocentric (or personal) networks is related to the ongoing participation of individuals in a social movement (the British Columbia Wilderness Preservation Movement). The results presented in this paper suggest that: communication, ongoing recruitment, and identification mediate the relationship between ego-network structure and level of movement participation. Different aspects of personal network structure have differential effects on these intervening processes. Finally, under conditions of low-medium riskhost activism, weak ties are more important to facilitating participation than are strong ties. SOCIAL, MOVEMENTS ARE C O L L E C T M T I E S OF PEOPLE who areengaged in trying to create or resist social change. Social movement organizations (SMOs)-organizations which are dedicated to fostering social change, and which may vary in the degree t o which they are formalized and institutionalized-are key actors in contemporary social movements * This research was supported by several fellowships and research grants from the Social Sciences and Humanities Research Council of Canada. I am grateful for the advice and support provided through a range of strong and weak ties to the following people:

Reducing global emissions will require a global cosmopolitan culture built from detailed attention to conflicting national climate change frames (interpretations) in media discourse. The authors analyze the global field of media climate change discourse using 17 diverse cases and 131 frames. They find four main conflicting dimensions of difference: validity of climate science, scale of ecological risk, scale of climate politics, and support for mitigation policy. These dimensions yield four clusters of cases producing a fractured global field. Positive values on the dimensions show modest association with emissions reductions. Data-mining media research is needed to determine trends in this global field.

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This article examines the relationship between structural location (namely, degree centrality) and news media coverage. Our central hypothesis is that the network centrality of social movement actors is positively associated with the prevalence of actors being cited in the print news media. This paper uses two-mode data from a communication network of environmentalists in British Columbia, and examines the relationship between their structural location and the frequency by which they are cited in newsprint media with regard to particular frames (about forest conservation, environmental protest, and related issues). We asked a sample of social movement participants about their ties to a target list of relatively high profile actors (environmental activists). We turned the resulting network matrix into a bipartite graph that examined the relationships amongst the target actors vis a vis the respondents. Next we calculated point in-degree for the target actors. For the target actors we also have data from a representative sample of 957 print news articles about forestry and conservation of old growth forests in British Columbia. We compare the effects of network centrality of the target actor versus several attributes of the target actors (gender, level of radicalism, leadership status) on the amount of media coverage that each of the target actors receives. We find that network centrality is associated with media coverage controlling for actor attributes. We discuss theoretical implications of this research. Finally, we also discuss the methodological pros and cons of using a "target name roster" to construct two-mode data on social movement activists.

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