The most important recent development in Brazil is the Superior Electoral Court’s emergency injunction against Meta’s WhatsApp, ordering the platform to shut down the pro‑Lula channel “Exército do Lula” within three hours and to preserve its data for a year. The order, which applies until the presidential runoff result is certified, targets a channel that grew from 55,000 followers on 5 Oct to over 2 million by 7 Oct, highlighting the court’s concern over coordinated digital mobilisation ahead of the election. This matters because the runoff between incumbent President Luiz Inácio Lula da Silva and challenger Flávio Bolsonaro is scheduled for 25 Oct, after a tight first‑round where Bolsonaro led with 47 % to Lula’s 45 %. The court’s action underscores the pivotal role of online platforms in Brazil’s electoral politics and signals that further legal measures could be taken to curb digital campaign tactics. Readers should watch for: (1) compliance by WhatsApp and any further enforcement actions; (2) the outcome of the runoff on 25 Oct; and (3) any additional electoral‑court cases related to digital campaigning as the final vote count is certified. [[1]]