In the past year, the discussion around “walled gardens” has become a focal point among media buyers and sellers. Media companies are holding onto significant amounts of information about their audiences while major global marketers are increasingly calling for greater transparency into this data, putting measurement center stage in the industry conversation. In this video David Wong, Senior Vice President of Digital Product Leadership at Nielsen, discusses the growth of these walled gardens, what they mean for the industry and the role Nielsen plays in providing consistent and comparable measurement across both digital and traditional media channels.