We introduce the idea of applying social network analysis to organizational access control. With current access control systems, users are typically assigned access to many more resources than they need and permissions are rarely updated. We propose to refine these access policies using the dynamic social network defined by intra-organizational emails. Email social networks within organizations...

User engagement in social networks depends critically on the number of online actions their users take in the network. Can we design an algorithm that finds when to incentivize users to take actions to maximize the overall activity in a social network? In this paper, we model the number of online actions over time using multidimensional Hawkes processes, derive an alternate representation of th...

Under what conditions do individuals feel free to express their emotions? To what degree are actors constrained by the social domain in which their emotions are activat-ed? To what extent are they bound by the hierarchical position that they occupy or by their status as a function of their gender, race, or class? Questions such as these are central to the sociology of emotion and illustrate how...