Livemarks is the answer, as explained at ResearchBuzz: "Check out Livemarks, which gives you a page of popular bookmarks on the left and then gives you a list of what bookmarks are being added in real-time on the right.This page also shows how many people are 'idling' at this page -- 100 when I looked at it."
There's 173 right now, so the buzz must be working!!
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