Explore a conference talk that delves into the use of social media as a passive sensor for studying human behavior and wellbeing in longitudinal research. Learn about an infrastructural framework for collecting social media data at scale within a multimodal sensing study of workplace performance. Discover the relationships between social media data and individuals' demographic, personality, and wellbeing attributes. Examine the characteristics of participants who consent to share their social media data versus those who do not. Gain insights into practical experiences and implications for HCI researchers conducting similar longitudinal studies utilizing social media data. The talk covers topics such as project overview, infrastructure framework, development challenges, data collection methods, personality traits, and key takeaways from the research.