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ELIZABETH KNITTLE, technology integration specialist for the Barnstable Public School District in Massachusetts, took her first tentative steps in the 3D online virtual world known as Second Life about two years ago. She wasn't impressed. "I looked around and I thought, this is crazy," Knittle recalls. "I just couldn't see the value of it, so I left. But then people starting blogging about it-- a lot of people-- so I had to reconsider. I decided that if I was going to understand this thing and be able to answer questions about it intelligently, I really just had to suck it up and get in there and participate. Once I connected with people inworld, it made all the difference." That early buzz among K-12 educators centered on Second Life's potential as a learning platform. And in the last few years, many colleges, universities, and libraries have established resources in what has become the preeminent multiuser virtual environment (MUVE). Today, more than 100 Second Life "regions" are used for educational purposes.

Another reason some bloggers have slowed down is sheer burnout. Siva Vaidhyanathan, a professor at the University of Virginia, shuttered his popular blog, Sivacracy, in September, in part because he was exhausted by the demands. "When you run your own blo

The world is full of visionaries and people who want to make a difference in the world, and many of those people share their knowledge online through their blogs. Whether you want to change the world through environment, humanitarianism, business, or any other way, there's a blog out there that can offer you guidance and inspiration. Read on, and you'll find 100 blogs that can help you change the world.