SEO Google | Rank on Google, Yahoo and MSN. - Tumblr and SEO: A Case Study in Rapid Response

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Tumblr and SEO: A Case Study in Rapid Response
Within about 48 hours, a single blog post resulted in a blog software/hosting site making significant changes to its architecture, almost entirely due to a conversation on FriendFeed. Why is this significant, and why was it so much more effective than simple C2B correspondence would have been?