The anatomy of urban social networks and its implications in the searchability problem.

The appearance of large geolocated communication datasets has recently increased our understanding of how social networks relate to their physical space. However, many recurrently reported properties, such as the spatial clustering of network communities, have not yet been systematically tested at different scales. In this work we analyze the social network structure of over 25 million phone users from three countries at three different scales: country, provinces and cities. We consistently find that this last urban scenario presents significant differences to common knowledge about social networks. First, the emergence of a giant component in the network seems to be controlled by whether or not the network spans over the entire urban border, almost independently of the population or geographic extension of the city. Second, urban communities are much less geographically clustered than expected. These two findings shed new light on the widely-studied searchability in self-organized networks. By exhaustive simulation of decentralized search strategies we conclude that urban networks are searchable not through geographical proximity as their country-wide counterparts, but through an homophily-driven community structure.

Power, gender stereotypes and perceptions of heterosexual couples.

This paper examines the relation between power attributed to members of heterosexual couples and the perception of their personalities in terms of gender stereotyped traits. Three-hundred and fifty adults, native French subjects (women and men) participated in the study. They attributed daily family tasks and decisions to the target persons; then, they described them on the Bem Sex-Role Inventory. The results indicated strong correlations between observers' representations of power distribution in the couple and the gender related personality descriptions of the couple. The attribution of 'instrumental' traits increased (and 'expressive' traits decreased) according to the degree of power assigned to the target person of either sex. On the 'instrumentality' dimension, accentuation of perceptions of people in gender role inconsistent positions was also observed. The simultaneous influences of general gender stereotypes and specific relations between the gender roles in dyads on the perception of individuals are discussed. It is proposed that social relations of dominance provide a model for the construction of gender stereotypes and their contextual applications.