网络社会关系的结构与演变：热烈讨论中的异质性
Structure and evolution of online social relationships: Heterogeneity in warm discussions
摘要：
随着信息时代的进步，人们越来越频繁地使用电子媒体进行通信，社交关系也越来越多地诉诸于网络渠道。传统的社交网络已经得到了广泛的研究，而在线社会网络的研究却很少。在这里，我们分析了在线社会关系的结构和演变，通过检查在一所大学的电子公告板系统（BBS）的时间记录。BBS数据集包括1，908个论坛，共有7，446名学生参与。边被分配给两个学生之间的每个对话，并且它被定义为每个消息中的from和to字段中的学生姓名的外观。这产生了一个加权网络之间的通信学生与一个明确的群体协会的个人。在一个典型的社区网络中，社区内（社区间）是强（弱）联系的，而BBS网络包含同时参与许多论坛的中心成员，但他们是强联系的，也就是说，他们具有很大的程度和介数中心性，并提供社区之间的沟通渠道。另一方面，内聚性是相当均匀和弱连接的。这种结构在过去从未被经验地描述过，可能会为这个数字时代的社会舆论形成提供一个新的视角。
英文摘要：
With the advancement in the information age, people are using electronic media more frequently for communications, and social relationships are also increasingly resorting to online channels. While extensive studies on traditional social networks have been carried out, little has been done on online social network. Here we analyze the structure and evolution of online social relationships by examining the temporal records of a bulletin board system (BBS) in a university. The BBS dataset comprises of 1,908 boards, in which a total of 7,446 students participate. An edge is assigned to each dialogue between two students, and it is defined as the appearance of the name of a student in the from- and to-field in each message. This yields a weighted network between the communicating students with an unambiguous group association of individuals. In contrast to a typical community network, where intracommunities (intercommunities) are strongly (weakly) tied, the BBS network contains hub members who participate in many boards simultaneously but are strongly tied, that is, they have a large degree and betweenness centrality and provide communication channels between communities. On the other hand, intracommunities are rather homogeneously and weakly connected. Such a structure, which has never been empirically characterized in the past, might provide a new perspective on social opinion formation in this digital era.
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