User demand for social media sites is growing. Online groups can share information via social media. Because social media is the fastest platform and the most updated instrument for today. The Indonesian Telegram community LyfeWithLess (LWL) promotes minimalism and zero-waste living. The LWL community has 5398 members in June 2023. Even still, just 273 members actively discussed trash management. This study examines the elements that affect LWL community members' waste management knowledge sharing intention (KSI). A questionnaire was completed by 97 LWL members who provided waste management knowledge for this study. SmartPLS processes data. In interviews, informants verified quantitative data processing outcomes, then the data continue to analysed and concluded. Virtual Community Commitment, Personal Expectations, and Social Media Use impact LWL KSI. Qualitative data processing shows all elements affect LWL KSI. A conceptual model of KSI in online communities utilizing Telegram for particular knowledge in Indonesia is available from this study. © 2025 IEEE.