eBay is one of the largest data-driven organisations in the world and prides itself on providing great consumer experiences by combining data and creative messaging to align with audiences – and then experimenting. Mark Mansour, Director of Advertising and Commercial Partnerships at eBay and co-chair of the IAB Ad Effectiveness Council, and Gai Le Roy discuss the importance of digital ad effectiveness, data-driven marketing and attribution. (Download the IAB Digital Ad Effectiveness Playbook here.)