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Social networks play a fundamental role in the diffusion of information. However, there are two different ways of how information reaches a person in a network. Information reaches us through connections in our social networks, as well as through the influence external out-of-network sources, like the mainstream media. While most present models of(More)
In this paper, we provide a characterization of the topological features of the Twitter follow graph, analyzing properties such as degree distributions, connected components, shortest path lengths, clustering coefficients, and degree assortativity. For each of these properties, we compare and contrast with available data from other social networks. These(More)
Even though human movement and mobility patterns have a high degree of freedom and variation, they also exhibit structural patterns due to geographic and social constraints. Using cell phone location data, as well as data from two online location-based social networks, we aim to understand what basic laws govern human motion and dynamics. We find that(More)
In networks, contagions such as information, purchasing behaviors, and diseases, spread and diffuse from node to node over the edges of the network. Moreover, in real-world scenarios multiple contagions spread through the network simultaneously. These contagions not only propagate at the same time but they also interact and compete with each other as they(More)
Supplementary Sections S1. Power-grid data. The data required for power flow calculations were obtained as follows. For the 10-generator system, known as the New England test system, the parameters were taken from ref. 47. For the 3-and 50-generator systems, the parameters were taken from refs. 30 and 48, respectively. The data for the Guatemala and(More)
The ever increasing popularity of location aware mobile devices, has facilitated the collection of large amounts of human mobility data. This data usually contains where a person was and when, which can give us an insight into the complex social behavior of people. In this paper we explore the use of co-location as a means to estimate the strength of(More)
s the amount of location information increases, location becomes one of the most vital attributes of a social media user, one that can bridge the gap between the user's online and offline activities. If all social media information were geolocated, then social media could play an important role in addressing serious and significant real-world problems, such(More)
here has been a great interest recently in systems that use graphics to aid in the programming, ' debugging, and understanding of computer systems. The terms ''Visual Programming'' and 'Program Visualization'' have been applied to these systems. This paper attempts to provide-t more meaning to these terms by giving precise definitions, and then surveys a(More)
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