Today's Top Discussions?

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What criteria has to be met before a discussion which you started is listed on the "Today's Top Discussions" list? I recently initiated a discussion which drew 16 responses which seems to be the average for the list. However, I noticed that it never made the list at all. I realize that being on the list probably isn't worth anything financially, but it is the principal that's at stake here. What is it that keeps some topics off the list and puts others on?