关键词: 社会网络, 关键节点, 拓扑结构, 信息传播, 主题模型

Abstract: With the advent of the internet plus era, social network has been given new functions and meanings, in which the key nodes occupy a crucial position in the topology, and bear significant functions in the social network. With the increase of data scale in social network, the holding data in the key nodes contains a great value, standing on the mining of key nodes and playing an oriented role of key nodes in social network which can help us to understand the operating mechanism and regularity of social network, further govern social network with innovativeness, and serve our economic society effectively.

Key words: social network, key nodes, topology, information propagation, topic model