Victoria L. Lemieux presented on using mixed-initiative social media analytics and visualization to innovate regulatory practices. The methodology uses sentiment analysis and visual analytics tools to explore historical Twitter data and measure public trust in regulatory processes. It aims to provide regulatory agencies support in notice-and-comment rulemaking by analyzing social media sentiment and discussion. The presentation highlighted the mixed-initiative social media analytics methodology and visualization tool developed, potential applications in regulatory impact assessment and rulemaking, and lessons learned from the project.