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In page Spamdexing:
Some link spammers utilize expired domain crawler software or monitor DNS records for domains that will expire soon, then buy them when they expire and replace the pages with links to their pages. However, it is possible but not confirmed that Google resets the link data on expired domains. To maintain all previous Google ranking data for the domain, it is advisable that a buyer grabs the domain before it is "dropped". Some of these techniques may be applied for creating a Google bomb — that is, to cooperate with other users to boost the ranking of a particular page for a particular query.
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