隨者社群媒體的快速發展，許多人使用社群媒體展現自我、建立與維繫人際關係。而當人們進入全新的環境時，社群媒體同樣扮演著重要的角色，人們會透過在社群媒體中建立不同的人際網絡，使自己更快速地融入新環境。因此，本研究以台灣大學新生使用Instagram大小帳適應新環境為例，探討其社群媒體使用動機、自我呈現策略以及線上社交網絡三者之間的關係。

本研究將社群媒體使用動機作為自變項、大小帳中的自我呈現策略作為中介變項、線上社交網絡作為依變項。本研究採線上問卷調查法，於民國112年1月完成問卷前測，並於同年6月完成正式問卷發放，共回收384份有效問卷。研究結果顯示，大學新生在適應新環境的過程中，維繫關係之動機最高，且經常在大帳中迎合他人，在小帳中展示真實自我，其線上社交網絡則以高聯繫強度、高同質性的族群為主。此外，使用動機會影響大小帳自我呈現策略與線上社交網絡，大小帳自我呈現策略也會影響線上社交網絡，而大小帳自我呈現策略在使用動機與線上社交網絡之間具備中介效果。

本研究探討人們在大學適應過程中的社群媒體使用情形與心理需求，除了提供校園單位在輔導新生適應新環境的相關依據與考量之外，也可豐富社群媒體、環境適應等領域的文獻內容，為該領域作學術貢獻。

With the rapid development of social media, many people use it to express themselves and build relationships. When people enter new environments, social media also plays a significant role. They use social media to establish different interpersonal networks, enabling them to adapt to the new environment more swiftly. Therefore, this study focused on Taiwanese university freshmen using real Instagram and fake Instagram to adapt to a new environment, exploring the relationships among their motivations for using social media, self-presentation strategies, and online social networks.

This research considered the motivation for using social media as the independent variable, self-presentation strategies in real Instagram (rinsta, which means a real Instagram account) and fake Instagram (finsta, which means a fake Instagram account) as the mediation variable, and online social networks as the dependent variable. The study administered an online questionnaire survey, conducting a pre-test in January 2023 and the final survey in June 2023, and a total of 384 questionnaires were collected. The findings indicated that the motivation for maintaining relationships was the highest among freshmen in the adjustment to college. They frequently ingratiated others in their real Instagram while presenting their authentic selves in fake Instagram. Their online social networks primarily composed of people with high strength of tie and high homophily. Furthermore, motivations for using social media impacted self-presentation strategies and online social networks. Self-presentation strategies also impacted online social networks, with the self-presentation strategies in the real Instagram and the fake Instagram mediating the relationship between motivations and online social networks.
This study delved into the usage patterns of social media and psychological needs of freshman. It provided insights and considerations for educational institutions in guiding freshmen's adaptation to new environments while also enriching the literature in the fields of social media and environmental adaptation, contributing academically to these domains.

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