Tracking message volume, emoji reactions, and poll participation shows real-time interest levels. Frequent questions or clarifications suggest strong attention, while silence may indicate confusion or passive viewing. Monitoring when people drop off the session or rejoin highlights moments where content loses or regains focus. Repeated themes in anonymous comments reveal what resonates most. Even timing patterns, like spikes during key slides, act like engagement heatmaps. Together these signals replace identity with aggregated behavior, helping speakers adjust pacing, simplify explanations, or invite interaction.