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Models for the processes by which ideas and influence propagate through a social network have been studied in a number of domains… Expand This publication contains reprint articles for which IEEE does not hold copyright. Full text is not available on IEEE Xplore for… Expand Twitter, a microblogging service less than three years old, commands more than 41 million users as of July 2009 and is growing… Expand Social network sites have gained tremendous traction recently as a popular online hangout spaces for both youth and adults… Expand Previous research has shown a relationship between use of social networking sites and feelings of social capital. However, most… Expand Operators of online social networks are increasingly sharing potentially sensitive information about users and their… Expand This study examines the relationship between use of Facebook, a popular online social network site, and the formation and… Expand Online social networking sites like Orkut, YouTube, and Flickr are among the most popular sites on the Internet. Users of these… Expand The co-authorship network of scientists represents a prototype of complex evolving networks. In addition, it offers one of the… Expand Editora s Preface to the Second Edition. Preface to the Second Edition. Acknowledgements. 1. Language, Class and Community. 2… Expand