Jessica Anslow engagement through subscriber chat reveals a channel the cascade had not explicitly planned for. Subscriber chat is a Substack feature that allows publication subscribers to interact with each other and the author in a community space. It sits between Notes (public, social) and Comments (article-specific, formal) — a persistent community space for ongoing conversation. The cascade should consider subscriber chat as a fourth Substack channel alongside Notes, Comments, and the main publication feed, with its own engagement strategy.