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Originally Posted by Tony Sena
I have noticed that I have had in the past supplemental pages showing in my index, but they were mostly from the forum I had on my site. Can you explain why supplemental pages are bad.
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When pages start going supplemental it means there is something about them that Google does not like. A supplemental designation means that the page was once in G's index, but has since been removed. Google "knows" about the page, but it is not scored in the ranking algorithms.
Why do pages go supplemental? There are a lot of theories. Pages that I have seen go supplemental are
link exchange pages, pages with (mostly) duplicate content, scraper site pages, made for Adsense type pages, affiliate pages, and pages with very little content.
In my own experience, a site with too many supplemental pages can lose all or most of its top rankings. Once the supplemental page issue has been corrected, the rankings will come back.