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This article proposes a theory of how interaction in groups influences differential participation in political activism and interrogates this theory through an empirical analysis of online Facebook group interaction. We study the refugee solidarity movement in a mixed methods design employing online ethnography, survey, and "big" social media data. Instead of conceptualizing the group as a social network or social movement organization (SMO), we argue that the group's culture emerges as patterns of interaction that have implications for what kind of activities in which group members participate. Based on observations from our online ethnography, we suggest that group interaction influences differential individual participation through processes of (1) encoding different habits and (2) attuning the activist to different aspects of situations. We support our theoretical propositions with six statistical tests of the relationship between the group-level variable of contentious group style and the individual-level variable of participation in political protest. The dependent variable, political protest , and a comprehensive set of controls stem from an original survey of the Danish refugee solidarity movement with 2,283 respondents. We link the survey data with "big" social media data used to estimate the focal explanatory variable, contentious group style , generated from content analysis of online interaction in 119 Facebook groups quantified with supervised machine learning. The results show that group style has a consistently positive relationship with the individual's degree of participation independent of networks, SMO framing, and individual attributes. [ABSTRACT FROM AUTHOR]

Gaining attention in the mass media is a key goal of many social movement organizations (SMOs). The dominant explanation of media attention to SMOs is that the media act like a filter, selecting some types of SMOs and events for attention, and ignoring others based on characteristics of these SMOs, events, and their political environment. In contrast to this "bias model," I argue that some media attention to SMOs is characterized by positive feedback, or rich-get-richer processes: past media attention increases the likelihood of future media attention through its effect on the SMO and on other media outlets. Like other positive feedback systems, media attention can be path dependent, is routinely punctuated by large cascades of attention to previously obscure SMOs, and can be contingent on "accidents" of history: at critical junctures, individuals, organizations, and events have the potential to radically impact the extent of media attention to their movements and organizations. Media attention to SMOs can also become decoupled from the types of events that initially sparked their media attention, becoming spokes-organizations for their movements and receiving media attention for events and stories that they themselves are not involved. In support of this theory, I first show that media attention is, similar to other positive feedback processes, power-law distributed across SMOs using two national (US) data sets. I then illustrate the process of positive feedback in media attention through a case study of the Black Panther Party's rise to prominence in media attention. [ABSTRACT FROM AUTHOR]