That picture wasn't what I was expecting, which was more like this: http://i.imgur.com/Lx6OiIb.png
solid arrows show chronology, the colors highlight compatibility, dashed arrows are backporting.
He's a people person. He talked to the end-users so the engineers didn't have to. Then the engineers could focus on what those people told him they wanted.
* might be an idea to have a feedback link (why I'm posting this here)
* scrolling becomes tedious very quickly. Needs a better overview mechanism. Eg only show the first N lines of a story unless I'm interested.
* Without some notion of how you're going to define relevance, I quickly became way of disliking something.
* You could have a way to like/dislike the author, as well as the post. Ie a way to say "I always/never want to read stuff written by this person".