Researchers, practitioners, and policymakers are increasingly interested in examining online posting behaviors in virtual communities known to facilitate violent racially and ethnically motivated extremism. However, little is empirically known about how such behaviors develop over time, and even less is known about how the content of posts is related to other posting behaviors. This study used group-based multi-trajectory modeling to explore how users’ online posting behaviors (i.e., posting frequency and use of offensive language) evolved as they engaged with other users on Stormfront, the largest and most well-known white supremacist forum, relative to typical user behaviors. Overall, several noteworthy posting behaviors were identified in the data. We conclude with a discussion of the implications of the analysis, its limitations, and avenues for future research.