本研究旨在探討不同平台特徵如何影響使用者的社交梳理行為策略，進而影響其主觀幸福感與社會安全感，以 Instagram 與 Threads 為例，分析同一使用者在兩平台間的行為一致性與策略轉換。
鑑於兩平台在互動設計與內容呈現上的差異，Instagram以圖像與影片為主，強調自我呈現與社交回饋；而 Threads 以文字交流為核心，傾向促進即時、私密且真實的情感互動。研究以社會交換理論與社交梳理理論為基礎，透過問卷調查蒐集 557 份有效樣本，並運用潛在類別分析（Latent Class Analysis）、配對樣本 t 檢定與變異數分析等統計方法加以驗證，分析平台特徵、社交策略與心理結果之間的關聯。
研究結果顯示，平台特徵確實影響使用者的社交梳理行為策略，Instagram 使用者傾向採取展示與形象導向的互動策略，而 Threads 則引導較親密與真實的交流形式。進一步分析指出，社交梳理策略與幸福感、社會安全感之間存在正向關聯，且平台特徵對心理結果的影響部分透過行為策略中介。
本研究揭示不同平台脈絡下的社交互動差異與適應性，說明平台設計如何形塑使用者的社會行為與心理經驗，並對未來社群媒體設計及使用者心理福祉推廣提出理論與實務層面上的啟示。

This study aims to explore how different platform characteristics influence users' social grooming strategies, thereby affecting their subjective well-being and sense of social security. Using Instagram and Threads as case studies, it analyzes behavioral consistency and strategy switching among the same users across both platforms.
Given the differences in interaction design and content presentation between the two platforms, Instagram emphasizes self-presentation and social feedback through images and videos. At the same time, Threads focuses on text-based communication, promoting real-time, intimate, and authentic emotional interactions. Grounded in social exchange theory and social grooming theory, this study collected 557 valid survey responses. It employed Latent Class Analysis, paired t-tests, and ANOVA to validate correlations between platform characteristics, social strategies, and psychological outcomes.
Results indicate that platform characteristics significantly influence users' social grooming strategies: Instagram users tend toward display and image-oriented interactions, while Threads fosters more intimate and authentic exchanges. Further analysis reveals positive correlations between social grooming strategies and well-being, with platform characteristics partially mediating this effect through behavioral strategies.
This study reveals differences in social interactions and adaptability across distinct platform contexts, illustrating how platform design shapes users' social behaviors and psychological experiences. It offers theoretical and practical implications for future social media design and for promoting users' psychological well-being.

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