憂鬱是當今社會普遍存在的心理健康困擾。過去的研究發現個體容易因感受到自己缺少與社會的連結而有憂鬱傾向。過去研究較少去探討缺少社會連結與憂鬱之間的影響機制，因此本研究嘗試提出一個調節式中介模型，研究假設社群媒體互動是缺少社會連結與憂鬱之間的中介變項，而個體知覺他人會在社群媒體上給予自己回應的程度（知覺回應）會對此關係產生調節效果。本研究以台灣地區18歲以上成人為研究對象，採用問卷調查法蒐集其自陳式缺少社會連結、憂鬱、社群媒體互動及知覺回應數據，共取得有效樣本363份。研究結果發現：（一）社群媒體互動在缺少社會連結和憂鬱之間有顯著的中介作用，缺少社會連結會透過降低社群媒體互動來增加憂鬱。（二）知覺回應對社群媒體互動與憂鬱之間的關係有顯著的調節效果，知覺低回應的個體，越容易因社群媒體互動低而增加憂鬱；而知覺高回應的個體，社群媒體互動與憂鬱間的負向關係會減弱。（三）缺少社會連結透過社群媒體互動對憂鬱產生的間接效果也會受到知覺回應的調節，對於知覺低回應的個體而言，越缺少社會連結時越會降低社群媒體互動，進而加重憂鬱；對於知覺高回應的個體，缺少社會連結透過社群媒體互動中介影響憂鬱的效果則會減弱。最後本研究根據以上研究結果進行討論和提供建議，供實務應用及未來相關研究參考。

Depression is one of the common mental health issue in modern society. Previous research has found that isolation and loneliness are related to depression, yet the underlying mechanisms between social disconnectedness and depression are not well understood. Present research therefore proposes a moderated mediation model to examine the association between them, hypothesizing that social media interaction serves as the mediating variable between social disconnectedness and depression, and the perception of responses on social media moderates this relationship. Self-reported data from 363 participants who aged 18 years old and above in Taiwan were collected through online questionnaires. Measures included social disconnectedness (modified UCLA Loneliness Scale and social isolation scale), depression (modified CES-D Scale), social media interaction and perceived responses. Results were consistent with the hypothesized conceptual scheme, social media interaction mediated the relationship between social disconnectedness and depression when individual’s perceived response on social media was low but not when perceived response was high. In sum, the findings indicated that social interaction and others’ responses through social media represents key mechanisms in determining how social disconnectedness is associated with depression. Theoretical and practical implications were discussed in this study.

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