Jeff Howe makes a convincing argument in "Crowdsourcing: Why the Power of the Crowd Is Driving the Future of Business" that the greater the diversity of the people in the group and the weaker the connections in the group (discussion density), the greater the lack of groupthink. I assume that the logic would follow similarly here. A lack of diversity (of background and independent thought) is the enemy of innovation - so it's not about the number of number of nodes so much as it is about the differences of the nodes themselves and the strength of the connection between them that matters. - Steffan Antonas from FriendFeed MT Plugin