What is a blog? A regularly updated journal published on the Web.
How many people blog? Technorati.com tracks about 112.8 million public blogs worldwide.
Other statistics:
• 175,000 new blogs are created each day
• 1.6 million posts are submitted each day, or about 18 updates a second
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How to make your blog private
• Blogger: help.blogger.com/bin/answer.py?answer=42673&query=private&topic=&type=f
• WordPress.com: faq.wordpress.com/category/security/
Source: technorati.com