In this paper, we present an efficient algorithm for finding overlapping communities in social networks. Our algorithm does not rely on the contents of the messages and uses the communication graph only. The knowledge of the structure of the communities is important for the analysis of social behavior and evolution of the society as a whole, as well as its individual members. This knowledge can...

Emotions play an essential role in the behaviour of human beings, either at their sudden occurrence or by the continuous care to prevent the occurrence of unpleasant ones and to search for the occurrence of pleasant ones. Notably, in any system of collective action, they influence the behaviours of the actors with respect to each others. SocLab is a framework devoted to the study of the functio...

Peer dislike of anxious behaviour was investigated in 7-12 year olds. Child actors delivered an identical verbal presentation: once in an anxious manner and once confidently. The videos were rated for liking and seven potential mediators by three groups of children: 32 anxiety-disordered peers with social phobia; 16 anxiety-disordered peers without social phobia; and 48 nonclinical peers. A med...

We present a Bayesian factorization model for discovering dynamic communities of actors in a social network and for describing action types associated with those communities. The structure of a social network is often hidden in the interactions among its actors. Typically, we observe interactions between pairs of actors (i.e., an edge) and our goal is to uncover their more complex relationships...

Attachment with altruistic others requires the ability to appropriately process affiliative and kind facial cues. Yet there is no stimulus set available to investigate such processes. Here, we developed a stimulus set depicting compassionate and critical facial expressions, and validated its effectiveness using well-established visual-probe methodology. In Study 1, 62 participants rated photogr...

Abstract This article investigates how sustainable entrepreneurship on digital platforms enacts connectivity to capture and create value. By complementing the business model lens with sociomateriality, we theorize technologies as key actors that participate in enactment of models. We analyze visual textual data from 19 entrepreneurial initiatives for sustainability established social media plat...

Most descriptions of service ecosystems, which provide the foundations for value co-creation, focus on resource integration. In contrast, this article emphasizes the actor’s key role as the foundation resource for value co-creation by looking at both societaland individual-focused realms, which include the different social aspects of service ecosystems. Institutional arrangements, positions, sc...

In a dynamic social or biological environment, the interactions between the actors can undergo large and systematic changes. In this paper we propose a model-based approach to analyze what we will refer to as the dynamic tomography of such time-evolving networks. Our approach offers an intuitive but powerful tool to infer the semantic underpinnings of each actor, such as its social roles or bio...

Health systems research aims to understand the governance of health systems (i.e. how health systems function and perform and how their actors interact with each other). This can be achieved by applying innovative methodologies and concepts that are going to capture the complexity and dynamics of health systems when they are affected by shocks. The capacity of health systems to adapt to shocks ...

BACKGROUND Evidence-informed health policymaking is a goal of equitable and effective health systems but occurs infrequently in reality. Past research points to the facilitating role of interpersonal relationships between policy-makers and researchers, imploring the adoption of a social network lens. This study aims to identify network-level factors associated with the exchange and use of resea...