I have seen this as well and have even found myself guilty of it after not seeing something the day before on a few occasions. This is a measurement of people just talking past each other and describes the narcissistic bubble we each live in perfectly. Basically, we're all out here "telling" and are too busy doing that to notice that to actually "listen" more. In other words, it's an indication of how people use this site to broadcast rather than receive or discuss.
Also note that you have multiple sources (which really aren't multiple sources, but rebroadcasting of the same datapoints) flooding the zone and this is why the algorithm here doesn't detect the reposts given that the web addresses of them are different.
If we were living in a society where people had more virtue (and I'm not trying to lecture anyone, as I know I have the problem myself and fight it daily) we'd see an instance or two and a lot of good comments and discussion about things rather than a bunch of postings with mostly zero comments.
(post is archived)