Hylo has a unique feature where content can be aggregated. Users can decide to show "Child" Group posts in the "Parent" Group Stream.
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Click on the "Child Group Post" toggle to turn on or off the aggregated display of posts from child groups (that you are a member of) in the stream of the parent group. Subgroup posts show up in the parent group stream ONLY for those who are members of that child group and parent group.