Mechanisms such as triadic closure and preferential attachment drive the evolution of social networks. Many models use these mechanisms to predict future links, and they generate realistic networks with scale-free degree distributions. These social networks also have community structure, or sets of vertices which are more connected to each other than the rest of the network. To study the evolut...

Cooperative breeding occurs when individuals help raise the offspring of others. It is widely accepted that help displayed by cooperative breeders emerged only after individuals' tendency to delay dispersal had become established. We use this idea as a basis for two inclusive-fitness models: one for the evolution of delayed dispersal, and a second for the subsequent emergence of helpful behavio...

In this paper, we propose methods and experiment with Flickr network to solve two problems. First, we study how the community in a social network evolves over time. We then report our findings about community evolution and new node behavior in the Flickr network. Second, we define the leader group of a network and propose novel mothods to measure the evolution of leader group. We then propose a...

This research suggests that the evolution of entrepreneurial spirit played a significant role in the process of economic development and the evolution of inequality within and across societies. The study argues that entrepreneurial spirit evolved non-monotonically in the course of human history. In early stages of development, the rise in income generated an evolutionary advantage to entreprene...