My basic thesis was that public folders are a “pull” technology, oriented toward request-response messaging patterns between people. Public folders are a topic-centric medium; you read a public folder post because it’s about a specific topic you’re interested in. In contrast, blogs are a “push” technology enabling pub/sub messaging between people. Blogs are centered on the individual; you read a blog not because it’s apropos to a specific topic, but because you’re interested in what one person has to say about a variety of subject matter.