Google Dance?
In simple language, Google Dance refers to the index update of the Google. It happens at least once a month. Google spiders crawl the World Wide Web and update content on Google.com. If you keep tabs on the Google Toolbar, you can know whether your overall page rank has changed. Webmasters are constantly looking out for ways to know when the upcoming spidering would start. There are many versions that crawl thousands of servers simultaneously. Some people have actually created programs that reach out to the data centers to know about when the last index had taken place.
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