Why blogging isn't a fad

Arnold Kling offers one of the best explanations I’ve seen of the value of blogging as a distributed information filtering mechanism.

"This filtering process makes all of us more efficient. Information with low value does not travel far. Information with high general value tends to travel the farthest. Information with low general value but high local value tends to reach interested people but then die out because as it gets passed along its value decays below the threshold. Everyone tends to receive information with a high value to them, and they avoid having to read information that has low value to them."