Online social networks represent a large share of our daily interactions. Conversations on these platforms are a rich source of data that may be used to better understand human behavior and the dynamics of user relationships, which can lead to or originate from particular participation patterns. These online social relations are often characterized by group-wise interactions, making hypergraphs, rather than traditional graphs, the ideal representation for complex, multi-actor interactions. This work aims to explore such high-order dynamics in online social media communities. Specifically, it focuses on subreddits-topic-specific communities on Reddit- and uncovers their underlying similarities and differences from a structural perspective.