Advertising systems used by very large online platforms and very large online search engines pose particular risks and require further public and regulatory supervision on account of their scale and ability to target and reach recipients of the service based on their behaviour within and outside that platform’s or search engine’s online interface. Very large online platforms or very large online search engines should ensure public access to repositories of advertisements presented on their online interfaces to facilitate supervision and research into emerging risks brought about by the distribution of advertising online, for example in relation to illegal advertisements or manipulative techniques and disinformation with a real and foreseeable negative impact on public health, public security, civil discourse, political participation and equality. Repositories should include the content of advertisements, including the name of the product, service or brand and the subject matter of the advertisement, and related data on the advertiser, and, if different, the natural or legal person who paid for the advertisement, and the delivery of the advertisement, in particular where targeted advertising is concerned. This information should include both information about targeting criteria and delivery criteria, in particular when advertisements are delivered to persons in vulnerable situations, such as minors.
