作为当前最热门的互联网应用,社交型媒体(social media)引起了国内外研究者的共同关注。有学者总结出社交型媒体的三大功能:微博客、信息服务和聊天工具;①有学者分析了传统媒体对社交型媒体的运 As the hottest Internet application at present, social media has aroused the common concern of domestic and foreign researchers. Some scholars summed up the three major functions of social media: micro-blogging, information services and chatting tools; ① Some scholars have analyzed the traditional media’s influence on social media