Google, in a challenge to Wikipedia, has created a user-generated online encyclopedia called Knol that identifies its writers instead of keeping them anonymous.
"Earlier this week, we started inviting a selected group of people to try a new, free tool that we are calling Knol, which stands for a unit of knowledge," the company wrote on its blog. "Our goal is to encourage people who know a particular subject to write an authoritative article about it."
Although it's already drawing comparisons to the best-known user-generated Web encyclopedia Wikipedia, Knol is different in a few key ways. First, unlike Wikipedia, authors of articles on Google's site are highlighted, not hidden. Similarly, articles on Knol aren't collaborative; they are written by just a single author.
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