Brazil represents a major market for online platforms. It is the leading country in terms of internet use in South America, and a key market for Facebook and WhatsApp. WhatsApp’s popularity and the online disinformation campaigns that have been coordinated on the platform are essential to understand Brazil’s approach to online regulation. The messenger app has been accused of being used “for the dissemination of fake news”, whilst critics of the “fake news” bill have said that it served as a “standard” for new regulation in the country based on the app’s existing limitations on forwarding messages and group size.