The ability to identify user attributes such as gender, age, regional origin, and political orientation solely from user language in social media such as Twitter or similar highly informal content has important applications in advertising, personalization, and recommendation. This paper includes a novel investigation of stacked-SVM-based classification algorithms over a rich set of original fea...

Most previous research on statistical approaches to social choice focused on the computation and characterization of maximum likelihood estimators (MLE) of various parametric ranking models. In this paper, we take a traditional statistical approach by evaluating social choice mechanisms w.r.t. two important statistical criteria: (1) consistency, a minimum requirement for reasonable estimators, ...

In this poster, we apply network analysis methods in two information networks: a social tagging network and a collocation network. We try to identify their distinct network patterns under different language environments and their relationship with IDF.

Several real-life complex systems, like human societies or economic networks, are formed by interacting units characterized by patterns of relationships that may generate a group-based social hierarchy. In this paper, we address the problem of how to rank the individuals with respect to their ability to “influence” the relative strength of groups in a society. We also analyse the effect of basi...

Social network analysis has become an extremely popular research area, where the main focus is the understanding of networks’ structure. In this paper, we study the expansibility of large social graphs, a structural property based on the notion of expander graphs (i.e. sparse graphs with strong connectivity properties). It is widely believed that social networks have poor expansion properties, ...

We study properties of five different social systems: (i) internet society of friends consisting of over 10 people, (ii) social network consisting of 3 × 10 individuals, who interact in a large virtual world of Massive Multiplayer Online Role Playing Games (MMORPGs), (iii) over 10 users of music community website, (iv) over 5 × 10 users of gamers community server and (v) over 0.25 × 10 users of...