Katherine M. FitzGerald

This study investigates post-truth messaging and participatory disinformation on Twitter, focusing on the activities of Craig Kelly, a former Australian member of parliament and a key figure previously accused of spreading health misinformation in Australia during the COVID-19 pandemic. We draw on Harsin's conceptualisation of post truth communication to analyse 4317 tweets and 5.2 million interactions with Kelly's account and his network of followers over a six-month period. Our novel empirical approach, combining coordination network analysis with a forensic qualitative approach, explores the participatory nature of online interaction, where fringe actors mobilise around Kelly's tweets. The findings demonstrate how political figures have a privileged and outsized role in public discourse, undermining scientific institutions and promoting anti-deliberative politics. This research underscores the role of participatory disinformation in the post-truth era and suggests that regulators, governments, and social media platforms work collaboratively to develop a whole-of-society framework to tackle misinformation.