随着移动互联网的不断发展，网络社交媒体平台创造了更多元的社交方式，网络空间虚拟社交越来越普遍，年轻的网络用户更主动地在网络社交媒体平台上进行自我呈现。“微记录”这一行为，从面对面社交时代到介质化社交时代，方式不断地更新迭代。每种微记录行为方式的发展并不意味着取代以往的微记录方式，而是对过往微记录行为一种形式上的补充与丰富。中国大学生群体是移动互联网使用主力军，其受教育的程度能更快地接受新鲜事物，有着强烈的倾诉欲和表达欲望。移动互联网时代，大学生群体在网络社交媒体平台上是如何进行自我呈现的？在不同的平台呈现内容是否有所差异？呈现的方式及行为特征又都是什么？又有什么样的动因促使他们更加积极地进行自我呈现？这一系列问题成为观察移动互联网时代社交媒体运行发展的重要视角，也是审视互联网时代当代中国大学生媒介化生存的重要维度。

本文使用拟剧理论、需求层次理论、传播生态模式等理论，对呈现平台、呈现内容、呈现方式和行为特征进行分析，探索并分析其自我呈现的动因，针对在大学生群体自我呈现过程中的典型问题进行反思和规范化建议。通过对不同时代人们的交流方式，分析中国大学生群体自我呈现驱动力的变迁，基于从面对面社交到介质化社交的转变，透视大学生群体进行自我呈现的方式与手段。

本文主要针对bilibili网站、小红书、微博这三个网络社交媒体平台进行样本收集与数据整理，根据各平台的定位差异、内容分布、用户特征进行有效的样本分析，以及抽取个案进行研究，总结出大学生“微记录”自我呈现的三大行为特征：后台行为的前台化，人物形象的多元化以及个人体验的再现化。在此基础上，运用传播生态模式理论，探究并分析了大学生群体进行自我呈现的三大动因：社会语境下的行为及目的，主要包括现实压力的缓解，自我个性的表达，人际关系的构建和他人认同的渴望等四个方面；信息技术的发展及赋能，技术的发展催生了更加多样化的自我呈现形式，同时给予了呈现主体更多自我呈现的手段及方式；传播范式的改变及赋权，给予呈现主体更多表达自我的平台与空间。

最终，本文针对性地提出了一些规范化策略及建议，建议大学生呈现主体需规范自我呈现方式及行为，平台加强监管力度，引导大学生群体进行更正向的自我呈现，净化网络环境。

With the continuous development of mobile Internet, online social media platforms have created more diversified ways to socialize, virtual socialization in cyberspace is becoming more and more common, and young online users are more active in presenting themselves on online social media platforms. The behavior of "micro-recording" has been constantly updated and iterated from the era of face-to-face socialization to the era of mediated socialization. The development of each micro-recording method does not mean replacing the previous micro-recording methods, but rather supplementing and enriching the past micro-recording behavior. Chinese college students are the main users of mobile Internet, their education level can accept new things faster, and they have strong desire to talk and express. In the era of mobile Internet, how do college students present themselves on online social media platforms? Are there any differences in the content presented on different platforms? What are the presentation methods and behavioral characteristics? What are the motivations for them to be more active in self-presentation? These questions become an important perspective for observing the development of social media in the mobile Internet era, and an important dimension for examining the mediated existence of contemporary Chinese college students in the Internet era.

The dissertation uses theories such as mimesis theory, hierarchy of needs theory and communication ecological model to analyze the presentation platforms By analyzing the changes of the driving force of self-presentation of Chinese college students through the communication methods of people in different times, we analyze the ways and means of self-presentation of college students based on the transformation from face-to-face social interaction to mediated social interaction.

This dissertation mainly focuses on three online social media platforms, namely, bilibili, Xiaohongshu, and Weibo, to collect samples and collate data, and conduct effective sample analysis based on the differences in positioning, content distribution, and user characteristics of each platform, as well as to extract case studies to summarize the three major characteristics of college students' self-presentation of "micro records The three major behavioral

characteristics of college students' "micro-record" self-presentation are summarized: the foregrounding of backstage behavior, the diversification of character image and the reproduction of personal experience. On this basis, the theory of communication ecological model is applied to explore and analyze the three main motives of self-presentation of college students: the behavior and purpose in the social context, mainly including the relief of real pressure, the expression of self-personality, the construction of interpersonal relationship and the desire for others' recognition; the development and empowerment of information technology, the development of technology has given rise to more diversified forms of self-presentation, and at the same time has given the presenting subject more self-presentation opportunities. The development and empowerment of information technology has given rise to more diverse forms of self-representation and more means and ways of self-representation for presenting subjects; the change of communication paradigm and empowerment has given presenting subjects more platforms and spaces to express themselves.

Finally, this dissertation puts forward some standardization strategies and suggestions, suggesting that college students should regulate their self-presentation methods and behaviors, and platforms should strengthen supervision to guide college students to make more positive self-presentation and purify the online environment.