abstract: the objective of this paper is to measure and explain the relationship between facebook users’ social capital and their political participation in real world. following political changes in the world and in the middle east, there are growing interest among researchers to work on political participation and facebook usage. we therefore developed this interest into this research paper i...

Twitter communication has permeated every sphere of society. To highlight and share small pieces of information with possibly vast audiences or small circles of the interested has some value in almost any aspect of social life. But what is the value exactly for a scientific field? We perform a comprehensive study of computer scientists using Twitter and their tweeting behavior concerning the sh...

The fact that selfish behavior may not achieve full efficiency at the collective level has been well also known in the literature. Therefore we need to cope with the socio-economic system by attempting to stack the deck in such a way that individuals with selfish incentives have to do what is the desirable thing. Of particular interests is the question how social interactions can be restructure...

Theoretically deduced concern about a declining legitimacy of the welfare state has been expressed regularly over the last thirty years. However, in that period empirical studies have repeatedly shown a permanent and substantial popular support for welfare. This mismatch might be due to two factors. Firstly, an inadequate understanding of people's motivations to support welfare, since the progn...

Abstract—Sustaining cooperation among self-interested agents is critical for the proliferation of emerging online social communities, such as online communities formed through social networking services. Providing incentives for cooperation in social communities is particularly challenging because of their unique features: a large population of anonymous agents interacting infrequently, having ...

Many local and global environmental challenges are tragedies-of-the-commons dilemmas in which private and collective interests are frequently at odds. Recent developments in social psychological theory and research suggest that in such commons dilemmas people are not just motivated by narrow (economic) self-interest but that they also consider the broader implications of their decisions for oth...

The rapid urban expansion has greatly extended the physical boundary of users’ living area and developed a large number of POIs (points of interest). POI recommendation is a task that facilitates users’ urban exploration and helps them filter uninteresting POIs for decision making. While existing work of POI recommendation on location-based social networks (LBSNs) discovers the spatial, tempora...