social features of online networks the strength of intermediary ties in online social media社交功能的在线网络中介联系在线社会媒体的力量.pdf

Social Features of Online Networks: The Strength of Intermediary Ties in Online Social Media 1 ´ 1 2,3 4,5 1 Przemyslaw A. Grabowicz , Jose J. Ramasco *, Esteban Moro , Josep M. Pujol , Victor M. Eguiluz ´ 1 Instituto de Fisica Interdisciplinaria y Sistemas Complejos (CSIC-UIB), Palma de Mallorca, Spain, 2 Instituto de Ingeniera del Conocimiento, Universidad Autonoma de ´ ´ ´ Madrid, Madrid, Spain, 3 Instituto de Ciencias Matematicas CSIC-UAM-UC3M-UCM, Departamento de Matematicas y GISC, Universidad Carlos III de Madrid, Leganes, Spain, ´ 4 Telefonica Research, Barcelona, Spain, 5 3scale Networks, Barcelona, Spain Abstract An increasing fraction of today’s social interactions occur using online social media as communication channels. Recent worldwide events, such as social movements in Spain or revolts in the Middle East, highlight their capacity to boost people’s coordination. Online networks display in general a rich internal structure where users can choose among different types and intensity of interactions. Despite this, there are still open questions regarding the social value of online interactions. For example, the existence of users with millions of online friends sheds doubts on the relevance of these relations. In this work, we focus on Twitter, one of the most popular online social networks, and find that the network formed by the basic type of