I like the idea of a FORUM type community and an official posts locked section, or a search by keyword to find the thread you want to find out about. For example, say two weeks ago we had a conversation about 'sage' on Natural Medicine, and someone wants to know about it - they can easily search for that post/conversation. Or you could get alerts for new comments for that thread (too much?). Separating out the various types of posts within the communities would be awesome.