本文通过对波士顿马拉松爆炸案的突发新闻报道进行案例分析，提出以移动式、社交 式、公民式为特征的“微媒体”概念。在对西方主流媒体的应对策略进行文献梳理的基础上 总结出从“新闻把关”发展到“新闻看门”直至“新闻策展”的实践操作及其理论基础。论 文进一步结合波士顿爆炸案报道案例对“新闻策展”作为一种“微媒体”环境下的突发新闻 报道方案作出剖析，将其策略归纳为逻辑整合、语境解读、细节描述三个步骤。与此同时， 基于对“网状新闻界”实践的理论反思，提出“实用主义”与“适时缄默”原则能够为策展 式报道突发新闻提供伦理层面的指导。

Taking the news practice of “Boston Bombing” reporting in the America in April 15th into a case study, this thesis elaborates an innovative concept “micro-media” which features mobility, social interaction and citizenship, and argues how this new form of media ecology poses critical challenges for professional news agencies in breaking news reporting in both the spatial and temporal dimensions. Roles employed by western media agencies to adapt to this “we-media” 24/7 news cycle environment can be categorized into “Gate-keeper”, “Gate-watcher” and “News- curator”. As a constructive insight yet theoretically soundless approach, ”news curator” strategy requires logical convergence, context and details in practice, and necessitates “appropriate silence” and “pragmatic philosophy” in ethics to guarantee journalistic professionalism.