Why do we blog?

"After a rain mushrooms appear on the surface of the earth as if from nowhere. Many do so from a sometimes vast underground fungus that remains invisible and largely unknown. What we call mushrooms mycologists call the fruiting body of the larger, less visible fungus. Uprisings and revolutions are often considered to be spontaneous, but less visible long-term organizing and groundwork — or underground work — often laid the foundation. Changes in ideas and values also result from work done by writers, scholars, public intellectuals, social activists, and participants in social media. " -- Rebecca Solnit, Hope in the Dark