What You Should Know About Google Supplemental Index

July 4, 2006 by’s Scott Goodyear has written an article explaining what Google Supplemental Index is all about and what you can do to prevent your pages from being marked as supplemental.

Pages that are considered spam, duplicate content or fail the Google indexing guidelines will be placed in this index.

This supplemental index contains many pages from sites that will never see the light of day during a typical search. These pages are found only when the search is so unusual or narrow that only pages from the supplemental index seem to be a match for the query. Since the " Big Daddy " update began in November 2005, many web masters are finding that while Google continues to crawl through their pages, and that updates to their pages do seem to be in Google’s cache, still more and more of their pages are being relegated to the supplemental index.

The main purpose of Google supplemental index implementation is to ensure unique pages are served in Google search result pages.

This does make a bit of sense. When you go on the web to look for a book by a given author, with a specific title, you don’t want to hit 600 affiliates from a single online book store that has the same exact web page content on the same book as the affiliates. You really want to see a variety of information such as a few book stores, a few reviews of the book, perhaps information about related books and movies, a bio on the author, etc. So an attempt to clear out as many duplicates as they can find can be useful for the end user but perhaps painful to those that are trying to sell an item or promote a service with little to no hands on activity/customization on their web site. And thus many sites are pushed into the supplemental index because they do not offer any thing that is compellingly different.

After the recent Big Daddy update, Google is giving more emphasis on the actual content of sites to drive rankings. Using inbound links and link exchange services to boost rankings do not work as well as it used to. Perhaps that’s what’s happening to the DigitalPoint’s Coop participants who see many of their pages dropped from Google index.

Read the full story: The Google Supplemental Index

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