The objective of this paper is to better understand peer popularity during adolescence and detect discrimination. High school students in Argentina are asked to select and rank 10 classmates with whom they would like to form a team to perform school activities, and this information is then used...

The availability of cheap wi-fi internet connections has stimulated schools to adopt Web 2.0 platforms for teaching. Using social networks and micro-blogs, teachers aim to stimulate students' participation in school activities and their achievement. Although anecdotal evidence shows a high level...

Despite recent advances in reputation technologies, it is not clear how reputation systems can affect human cooperation in social networks. Although it is known that two of the major mechanisms in the evolution of cooperation are spatial selection and reputation-based reciprocity, theoretical...