Why do people blog

The majority of bloggers openly expose their identities on their blogs and recognize the positive impact that blogging has on their personal and professional lives. More than half are now better known in their industry and one in five have been on TV or the radio because of their blog.

One-third of bloggers are concerned for their privacy. The biggest reasons center around family and friends being harassed or disapproval from friends, family, or employers on views expressed in the blog. - Technorati.