This research briefing outlines findings from an analysis of the far-right and far-left Facebook ecosystem in Australia in the first seven months of 2020. It analyses how the far-right and far-left discuss each other on Facebook and how narratives about the other side of the political spectrum shape the online activity of these groups. It also seeks to understand how central discussion about the ‘other side’ is to the far-right and far-left and how it fits within the broader online activities of these movements.