In recent years, far-right organisations have formed in response to what they believe to be the threat from the rise of Islam in Australia. Parallel movements have spawned an extensive literature internationally. In this study I investigate this movement in Australia using automated text analysis of all public posts from two of the most popular Australian anti-Islam groups on social media. This approach complements traditional polling methods by offering access to large samples of the spontaneously generated opinions, allowing subjects to speak in their own words. My analysis finds evidence that concerns about terrorism and the perceived political threat from Islam are paramount in these groups' discussion of Muslims. I conclude by discussing the implications for counter-messaging strategies.