What Teoma does is extend this a little by finding the sites that concern themselves with the search string. Then it takes its rankings from the number of links within these sites to a particular site. It could probably be more easily explained by saying that Google asks about a certain expert in a field and then goes and takes a poll from people in the street over which one they think is best. Teoma would ask all the experts in the field which one of themselves they think is best.
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