In fact, look back at this 2007 Google blog post about Knol, where Manber says “The challenge posed to us by Larry, Sergey and Eric was to find a way to help people share their knowledge. This is our main goal.”
One way of thinking of this, says a source with knowledge of the group, is this. Singhal does the weeding (removing and pushing down low quality content in search), and Manber is focused on the seeding (encouraging “good stuff” to grow).
Posted from Diigo. The rest of my favorite links are here.