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@evan @erincandescent @julian @mikedev @silverpill Multiple collections (or any object type) can exist while sharing the same group of agents (or any other non-group set of agents) as an audience. It's not correct to say that a room "is" the group, unless you want everyone to manually join every single room one-at-a-time. The audience is the scope to which the posts (or collection of posts) are relevant, similar to how the context is the grouping. https://www.w3.org/TR/activitystreams-vocabulary/#audience-and-context