As millions of people use ChatGPT for tasks such as education, writing assistance, and health advice, concerns have grown about how personal prompts and data are stored and used. This study explores how Reddit users collectively negotiate and respond to these privacy concerns. Posts were collected from three major subreddits -- r/Chatgpt, r/privacy, and r/OpenAI -- between November 2022 and May 2025. An iterative keyword search followed by manual screening resulted in a final dataset of 426 posts and 1,900 comments. Using information practice as the theoretical lens, we conducted a qualitative thematic analysis to identify collective practices of risk negotiation, validated with BERTopic topic modeling to ensure thematic saturation. Findings revealed risk signaling, norm-setting, and resignation as dominant discourses, and collective troubleshooting and advocacy for privacy-preserving alternatives as key adaptive practices. Reddit functions as a site of collective sense-making where users surface risks, establish informal norms, and share strategies for mitigating privacy threats, offering insights for AI design and privacy literacy initiatives.

翻译：随着数百万人使用ChatGPT进行教育、写作辅助和健康咨询等任务，关于个人提示词与数据如何存储及使用的担忧日益增长。本研究探讨Reddit用户如何集体协商并回应这些隐私关切。研究收集了2022年11月至2025年5月期间来自三个主要子论坛——r/Chatgpt、r/privacy和r/OpenAI——的帖子。通过迭代式关键词检索及人工筛选，最终获得包含426条主帖与1900条评论的数据集。以信息实践为理论视角，我们采用质性主题分析法识别风险协商的集体实践，并借助BERTopic主题建模进行验证以确保主题饱和。研究发现：风险警示、规范制定与无奈接受构成主导性话语；集体故障排除及倡导隐私保护替代方案成为关键适应性实践。Reddit作为集体意义建构的场域，用户在此揭示风险、建立非正式规范并分享隐私威胁缓解策略，为人工智能设计与隐私素养教育提供了重要启示。