From sparse to dense and from assortative to disassortative in online social networks

Inspired by the analysis of several empirical online social networks, we propose a simple reaction-diffusion-like coevolving model, in which individuals are activated to create links based on their states, influenced by local dynamics and their own intention. It is shown that the model can reproduce the remarkable properties observed in empirical online social networks; in particular, the assortative coefficients are neutral or negative, and the power law exponents are smaller than 2. Moreover, we demonstrate that, under appropriate conditions, the model network naturally makes transition(s) from assortative to disassortative, and from sparse to dense in their characteristics. The model is useful in understanding the formation and evolution of online social networks.Comment: 10 pages, 7 figures and 2 table

Visual methods in research with migrant and refugee children and young people

This chapter examines how visual methods have been used in understanding and interpreting children’s worlds. Focusing on social sciences engagement with diverse visual methods (like drawing, maps, photographs, and videos), the chapter contributes to the discussion about their value and limitations. The chapter broadly reviews the body of knowledge on the use of children’s images in research. It provides some references to the research in health social sciences, however, focuses particularly on migrants and refugees. Although visual images play a meaningful role in the lives of young people, social sciences still privileges approaches based on words and numbers. Children’s visual methods, however, are gaining increasing interest as many social scientists search for methods that align with the current conceptualization of children as social agents and cultural producers. It has been argued that visual methods can secure participant engagement and reflexivity among a group who may not be comfortable with a traditional survey, interview, or focus group methods. Exploring specific examples of the studies with migrant and refugee children and young people, the chapter demonstrates how visual methods can be evaluated as a research strategy