近年来，随着我国国际影响力的增强和海外人才吸引政策的出台，华人华侨后代回中国接受高等教育呈不断增加的态势，而传播学界针对这一“反向教育流动”的华裔新生代的研究还较少。 考虑到华裔新生代的独特性及其在我国国际传播工作中的重要桥梁作用，本研究通过访谈和问卷调查相结合的混合研究方法，从社交媒体可供性视角切入，探讨其在中国如何使用和理解社交媒体，并在过程中与其身份认同产生互动的影响机制。研究一基于访谈和编码界定了华裔新生代“社交媒体通俗可供性”概念，包含平台功能和文化、认同探索和隐私顾虑三个维度。研究二以认同加工理论为基础，通过对220名中国高校在读的华裔新生代的问卷调查发现：丰富的平台功能和多元文化环境有利于华裔新生代建构清晰的身份认同。而线上认同探索行为可能导致其身份认同混乱。此外，隐私顾虑对华裔新生代在社交媒体上的认同建构产生了消极影响。认同加工风格作为关键中介变量，在社交媒体通俗可供性的不同维度与认同清晰度的关系中起重要作用。最后，认同韧性在主动获取信息型和回避型认同加工风格对认同清晰度的影响中均呈现显著的调节作用，还在回避型认同加工风格对认同探索、隐私顾虑与认同清晰度的中介作用中显示出显著调节效应。表明：个体在面对认同困境时，较高的认同韧性能够缓冲回避策略对认同清晰度的负面影响，并在一定程度上转化为积极的认同建构动力。 本研究从现实层面启发技术公司在平台设计上应注重文化多元性和隐私保护机制；中国高校和政府在引导华裔新生代进行线上认同探索时，可从认同韧性入手进行干预，从而助力华裔新生代应对反向教育流动带来的身份认同挑战，激发华裔新生代了解和传播中国的动力，提高我国国际传播影响力。从理论层面来看，本研究拓展了可供性和身份认同研究的具体情境，为通俗可供性在社交媒体领域研究的应用提供了新视角，也基于一手访谈资料编制了社交媒体通俗可供性量表，进一步明确了通俗可供性在华裔新生代身份认同语境下的概念化和操作化定义，为通俗可供性视角的社交媒体研究提供借鉴和参考。此外基于传播学视角，结合社交媒体媒介环境和华裔新生代特殊群体去研究身份认同，推动了身份认同的跨学科研究创新。

In recent years, amidst China's growing international influence and the implementation of policies attracting overseas talent, there has been a surge in the number of overseas Chinese descendants returning to China for higher education, constituting a "reverse educational flow." However, scholarly investigations within communication studies on this cohort of new generation of ethnic Chinese, particularly regarding their role as pivotal bridges in international communication, remain limited. Given the uniqueness of this young Chinese diaspora and their importance in China's international communication endeavors, this study employs a mixed-methods research approach, combining interviews and questionnaire surveys, to examine from the perspective of social media affordances how they utilize and comprehend these platforms in China, and the interactive mechanisms through which this engagement influences their identity formation. Study 1, based on interviews and coding, delineates the concept of "vernacular social media affordances" for this group, encompassing three dimensions: platform functionalities and culture, identity exploration, and privacy concerns. Study 2, grounded in identity processing theory and analyzing data from 220 new generation of ethnic Chinese in Chinese universities, reveals that a rich array of platform features and a multicultural online environment facilitate clearer identity formation among these individuals. Conversely, online identity exploration behaviors may lead to identity confusion. Moreover, privacy concerns exert a negative impact on their identity construction on social media. Identity processing styles emerge as crucial mediating variables in the relationship between different dimensions of social media vernacular affordances and identity clarity. Importantly, identity resilience significantly moderates the effects of both informational and diffuse-avoidant identity processing styles on identity clarity, as well as the mediating effect of these styles on the relationship between identity exploration, privacy concerns, and identity clarity. This highlights that higher identity resilience can mitigate the detrimental impacts of avoidance strategies on identity clarity during periods of identity challenge, potentially converting them into positive forces for identity construction. Practically, the study suggests that technology companies should prioritize cultural diversity and privacy protection in platform design. For Chinese universities and the government, interventions targeting identity resilience can aid this young diaspora in navigating the identity challenges accompanying reverse educational migration, fostering their motivation to understand and disseminate information about China, thereby enhancing China's international communication prowess. Theoretically, this research enriches the understanding of affordance and identity studies within a specific context, offering a fresh viewpoint on the application of vernacular affordances in the realm of social media research. By devising a scale for popular social media affordances based on primary interview data, it clarifies the conceptualization and operationalization of affordances in the context of identity formation among this unique demographic, providing a valuable reference for future research. Furthermore, by integrating communication perspectives with the social media milieu and the distinctiveness of this group, this study advances interdisciplinary innovation in identity research.