The document discusses the results of the first Social Engagement Index, which measures audience engagement with television shows on social media. It found that One Tree Hill had the highest level of social engagement of any show in 2009, driven by its story format, demographic audience, and established social media presence. The Index provides a more accurate measure of engagement than conventional metrics by tracking social interactions in real-time while a show airs rather than the day after. Socially engaged viewers watch for longer periods and are more valuable to networks and advertisers.