ANA calls for independent audits of ads in the ‘walled gardens’
All “walled gardens” need some windows. That’s the essential message from the Association of National Advertisers (ANA), which today issued a call for independent audits in the “walled garden” advertising platforms of Amazon, Foursquare, LinkedIn, Pinterest, Snapchat and Twitter. Facebook, Instagram and Google’s YouTube are not on the list, because they committed last month to…