Cover by Carl D. Meyer, Amy N. Langville

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Chapter Ten

Updating the PageRank Vector

Every month a famous dance takes place on the Web. While there have been famous dances throughout modern history—the Macarena, the Mambo #5, the Chicken Dance—this dance is the first to have a profound impact on the search community. Every month search engine optimizers (SEOs) watch the Google Dance carefully, anxious to see if any steps have changed. Sometimes the modifications are easy to roll with, other times they cause a stir.

The Google Dance is the nickname given to Google’s monthly updating of its rankings. We begin with some statistics that emphasize the need for updating rankings frequently. A ...

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