Despite a potentially vast audience in cyberspace, the Pew project found that 52 percent of bloggers said they blogged mostly for themselves. When asked for a major reason for blogging, 52 percent said it was to express themselves creatively and 50 percent said it was to document and share personal experiences.

Chris Anderson, the editor in chief of Wired, a magazine about technology and culture, said the Pew report was accurate. “The finding that jumped out at me was the recognition that people are talking about the subjects that matter in their personal lives,” he said.

Mr. Anderson, the author of the book “The Long Tail: Why the Future of Business Is Selling Less of More” (Hyperion), said that the Pew report shows how the blogosphere is unlike traditional media. “It’s narrow, niche subjects,” he said. “It’s a granularity of media that we in the commercial media could not scale down to. Niche media is ‘me’ media, and the blogosphere is the ultimate manifestation of that.”

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