As was the case with the "Ted Casablanca" Defamer post that got caught up in a bug report which I wrote about previously, it doesn't appear to take a lot of traffic to get something in the "most active" sidebar. Therefore, I envision that especially in the middle of the night, there could be times when we're halfway following each other around, particularly through old posts.
I know from my own reading of Defamer, it has already occurred.
ETA: It's also interesting to note that this
re-top reframe gets it's own entry in the sidebar. I actually came to the comparison via a comment that I made on the ObservationDeck and because my tendency is to link everything out, the "My Fault" post is directly linked from there, so that could be the source of its traffic. Though, without having yet studied Chartbeat and its relationship to Kinja, I can see how it could also be possible for one view to be counted twice.