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Web sites like Yahoo! And Alta Vista started out as search engines. By offering all types of services they have evolved into town centers
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Niche or Hub portals are sites that are focused on a specific industry or interest. They are the first place people go within and industry or interest to find information.
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Intermediators (also called market place) are places people go to buy and sell goods. Companies like eBay are a market place for people to sell and buy goods. Many trade groups and business are in the process of creating industry market places for business to business procurement.
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