This paper aims to complement the OECD Recommendation of the Council on Consumer Protection in E-Commerce by elaborating on its key principles in the context of online advertising and offering practical guidance on how to apply these principles. For these purposes, the guide provides a number of...

We quantify the prevalence of undisclosed influencer posts on Twitter across a large set of brands based on a unique data set of over 100 million posts. We develop a novel method to detect undisclosed influencer posts and find that 96% of influencer posts are not disclosed as such. Despite...