To see the previous day's "Daily discussion thread", click the "yesterday" link.
Shouldn't those also appear under the Posts link for @k00b?
Because pins are special posts they won't show up as posts.
I suspect you want to see a list of them?
Calling it "yesterday" is a bit confusing. It makes me think that this thread is from yesterday (since this is the spot in the UI where you can see how old the post is...)
I could also do "previous" or "prior" ... yesterday just seemed more specific but I can see how it might be ambiguous in another way.
That, or some way to quickly go back to look at something a week or two back.
Not really a big deal, ... once I found the "yesterday" link, that was sufficient.