This document discusses justifying social media investment and measuring return on investment (ROI). It notes that only 35% of companies feel social media delivers good ROI and 40% have no way to measure it. However, social media can provide active brand advocates to reduce churn and increase retention and engagement. When done correctly, like in the success stories of KLM, GoPro and Foursquare, social media can significantly increase ticket/product sales and deliver measurable ROI through increased revenue and reduced customer acquisition costs.