The document discusses measuring the effectiveness of advertising across different platforms. It presents principles of reach, resonance, and reaction for determining effectiveness. It then provides examples from Nielsen's studies that show lifts in key metrics like in-store visits, product awareness, and favorability from being exposed to ads on mobile, social media, and native advertising formats. Specifically, exposure resulted in 45% lift in mobile intent, 11.3% lift in social media awareness, and 82% lift in native ad favorability.