Quoting Knowledge@Wharton:
About 57 million American adults -- or 39% of Internet users -- read individually authored web logs, or "blogs," according to the Pew Internet & American Life Project, which does surveys to track Internet use. About 12 million American adults, or 8% of Internet users, keep a blog.
The article then goes onto talk about how professors at Wharton are using blogs, not only to stay up-to-date by reading but using them to teach.
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