This report analyzes the effectiveness of different types of media on Facebook, including paid media (homepage ads), paid media with social context (homepage ads featuring friends who are fans), and earned media (organic impressions generated by users sharing with their friends). The study uses Nielsen's BrandLift methodology to measure the impact of these media types on key metrics like ad recall, awareness, and purchase intent. The results provide insights into how to optimize campaigns by combining paid and earned media to maximize both reach and effectiveness.