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About.com is a small manual operation (Human reviewed/manually picked) directory index, mainly by the editors on the Internet to find a valuable site or Web pages, and then list the linked index. Of course webmaster can also voluntarily submit a website, application about your site, but this work is not easy. If you want to login successfully, there must be a good reason to convince the editor that your site is worth being included, but once the editors agree to receive your site, they will be listed soon.
About the level two Web search is provided by the renowned search technology developer Inktomi.
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