Supplemental Index – Why are big sites falling victim?
by Alan RabinowitzThe supplemental index has become a tool for Google to place less valued pages into to try and fine-tune the quality of its main index. In fact, the current supplemental index is growing rapidly and may be trying to get into the “Size Wars” of Millions of pages indexed. – OK, so I may like to exaggerate a little, but the fact is this is an index that is going through changes and has its own updates. Meaning 6 months ago a site in the Google index was there for duplicate content, now there are other reasons that Google is using to value sites and place poorly created pages into the supplemental index.
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