中文摘要：

随着Web2．0技术的产生，在线社交网络平台得到了迅速的发展。本文首先综述了近年来基于复杂网络理论的在线社交网络结构方面的研究成果，从网络拓扑结构这一底层机制的角度出发，指出不同类型在线社交网络形成的差异。以北京邮电大学某实验室的社交网络关系为实证研究对象，证实了以研究为目的的科研团体及沟通紧密型网络结构对信息传播的影响，有助于了解信息在网络中的传播特征，进一步分析网络结构与传播媒介的作用机理。

英文摘要：

With the generation of Web 2.0 technology, online social network platforms have developed a lot. The findings of online social network structure based on complex network theory in recent years are reviewed first. From the aspect of underlying mechanism network topology, the formation differences of different online so- cial networks are pointed out. Then taking the social network relationships of one laboratory of Beijing University of Posts and Telecommunications as an example, the influence of the structure of scientific communities and com- pact communication networks on information dissemination is confirmed, which helps understand the dissemina- tion characteristics of information in network and the mechanism of network structure and social media is further analyzed.