This article examines the role of migrant social networks in international migration and extends prior research by testing the strength of tie theory, decomposing networks by sources and resources, and disentangling network effects from complementary explanations. Nearly all previous empirical research has ignored friendship ties and has largely neglected extended-family ties. Using longitudina...

In Asian nations, family ties are considered important. However, it is not clear what happens among older people with no such ties. To investigate the association, we used longitudinal data from the Aichi Gerontological Evaluation Study (AGES) project. Functionally independent older people at baseline (N = 14,088) in 10 municipalities were followed from 2003 to 2013. Social ties were assessed b...

We use a sample of publicly available data on Twitter to study networks of mostly weak asymmetric ties. We show that a substantial share of ties lie within the same metropolitan region. As we examine ties between regional clusters, we find that distance, national borders and the difference in languages all affect the pattern of ties. However, Twitter connections show the more substantial correl...

We have developed a cohesive extraction based single document summarizer (COHSUM) based on coreference links in a document. The sentences providing the most references to other sentences and that other sentences are referring to, are considered the most important and are therefore extracted. Additionally, before evaluations of summary quality, a corpus analysis was performed on the original doc...

This paper studies which social networks maximize trust and welfare when agreements are implicitly enforced. We study a repeated trust game in which trading opportunities arise exogenously and a social network determines the information each player has. We show that cohesive communities, modeled as social networks of complete components, emerge as the optimal community design. Cohesive communit...