David Cancel gave a presentation on data-driven marketing for startups. He emphasized that online marketing is shifting from an outbound model focused on visitors and pageviews to an inbound model focused on leads and conversions, and ultimately a lifecycle model centered around customers. He outlined three steps for startups to take a data-driven approach: 1) create an operating dashboard to monitor key metrics, 2) analyze conversion funnels to improve the customer journey, and 3) perform cohort analysis to understand churn and retention over time. The goal is to use quantitative and qualitative data to test assumptions and optimize the business for learning rather than vanity metrics.