Abstract
A large body of information and opinion related to COVID-19 is being shared via social media platforms. Recent reports have raised concerns about the reliability and verifiability of said information being disseminated and the way systems, processes and design of the platforms facilitates such spread. This, alongside other areas of concern, has resulted in several social media platforms taking steps towards tackling the spread of mis- and dis-information. Here we discuss approaches to online public health messaging from a range of sources during COVID-19, with a focus on official and non-official sources in the United Kingdom. We highlight issues for ongoing public health decisions, and the potential impact for the future course of the pandemic.