社交媒体群体极化背景下中介人识别及其信息传播效率影响研究  

Research on Identification of Brokers and Their Impact on Information Dissemination Efficiency in the Context of Social Media Group Polarization

作　　者：戴建华[1] 程欣怡 DAI Jianhua;CHENG Xinyi(School of Economics and Management,Nanjing University of Science and Technology,Jiangsu Nanjing 210094)

机构地区：[1]南京理工大学经济管理学院,江苏南京210094

出　　处：《情报理论与实践》2025年第4期118-124,共7页Information Studies:Theory & Application

摘　　要：[目的/意义]旨在运用网络分析的方法,研究社交媒体上的信息中介节点在弥合不同声音、交换不同观点方面发挥的关键作用。[方法/过程]通过分析社交媒体应用平台——“推特”上交流互动的实例数据,在可视化两方政党之间的意见极化现象的基础上,提出了改进的中介中心性指标算法,将中介中心性指标值高的节点视为极化网络中的隐性关键中介节点,通过SI模型仿真模拟信息在社交极化网络中的扩散过程,探究了关键的中介节点在信息传播中呈现的重要作用。[结果/结论]结果显示,当中介节点被移除时,极化网络中信息传播速度显著下降,特别是在跨社区的传播中,传播范围和效率均受到了严重影响。这表明中介节点作为连接不同社区的桥梁节点,通过填补社区间的结构洞,极大地提升了信息的跨社区传播效率。[Purpose/significance]This study aims to employ network analysis methods to study the critical roles of information broker nodes play in bridging different voice and exchanging various opinions in social media.[Method/process]Using interaction data from the social media platform“Twitter,”this study visualizes opinion polarization between two political parties and proposes an improved betweenness centrality algorithm.Nodes with high betweenness centrality are identified as invisible key broker nodes within polarized networks.The SI model is employed to simulate the information diffusion process in socially polarized networks,exploring the vital role of these key broker nodes in information dissemination.[Result/conclusion]The results indicate that removing broker nodes significantly reduces the speed of information dissemination in polarized networks.This effect is particularly pronounced in cross-community dissemination,where both the scope and efficiency of information spread are severely impacted.These findings demonstrate that broker nodes,acting as bridge nodes connecting different communities,significantly enhance the efficiency of cross-community information dissemination by filling structural holes between communities.

关 键 词：群体极化 结构洞 中介节点 SI传染病模型 信息扩散 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]