In practice it already does that most of the time in that the site has enough activity that all of the boards on the list usually have posts from within the last 24 hours. What I mean is that the # of posts shown next to the board name indicate the number of posts made to that board in the last 24 hours( it currently shows total posts to the board). Might tip people to a particularly hot topic even if it isn't the #1 board on the list.
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