Social networks

Friends have been implicated in the acquisition of adolescent substance use, but little attention has been given to how the origins of substance use similarity vary across groups. The first aim of this study is to examine whether friend selection, de-selection, and socialization differ as a function of friendship group's substance use. The second aim of this study is to extend Simulation Investigation for Empirical Network Analyses (SIENA) by demonstrating how group-level interactions can be included in the mode, and to demonstrate a new method to follow-up statistically significant group-level interactions in SIENA. Participants include 1419 Finnish students (729 females, 690 males) from upper secondary schools in Finland. Two waves of data were collected, starting when most participants were between 15 and 17 years of age. Waves of data collection were separated by one year. Results indicate that friends are selected, deselected, and socialized for substance use. Follow-up illustrations indicate that the magnitude of these processes vary as a function of substance use in the friendship group.

Researchers who study Brazilian immigrants in the United States have noted a lack of camaraderie and social networks among Brazilians. Based on recent research conducted in Broward County, Florida, Manuel Vâasquez argues that while there are clear structural impediments to community formation among Brazilian immigrants, Brazilians do form social networks. This thesis examines the survey and ethnographic data from Vâasquez's sample to test a series of hypotheses about which factors impact levels of social capital and the potential for network creation and mobilization among Brazilian immigrants. Analysis of the data suggests that religious participation and levels of perceived discrimination are correlated with higher levels of social capital in this sample. For a group of immigrants characterized by a lack of collective solidarity and facing an increasingly hostile economic and social climate, religious organizations may be essential locales for achieving sufficient social capital for social, economic, and political integration.