17 Jun 06
15 May 07 3:17 am
Info on Supplemental Search Engine Results
What are supplemental results?
Supplemental results usually only show up in the search index after the normal results. They are a way for Google to extend their search database while also preventing questionable pages from getting massive exposure.How does a page go supplemental?
Pages have typically went supplemental when they became isolated doorway type pages (lost their inbound link popularity) or if they are deemed to be duplicate content. For example, if Google indexes the www. version of your site and the non www. version of your site then likely most of one of those will be in supplemental results.
If you put a ton of DMOZ content and Wikipedia content on your site that sort of stuff may go supplemental as well. If too much of your site is considered to be useless or duplicate junk then Google may start trusting other portions of your site less.Negative side effects of supplemental:
Since supplemental results are not trusted much and rarely rank they are not crawled often either. Since they are generally not trusted much and rarely crawled odds are pretty good that links from supplemental pages likely do not pull much - if any - weight in Google.How to get out of Google Supplemental results?
If you were recently thrown into them the problem may be Google. You may just want to give it a wait, but also check to make sure you are not making errors like www vs non www, content manangement errors delivering the same content at multiple URLs (doing things like rotating product URLs), or too much duplicate content for other reasons (you may also want to check that nobody outside your domain is showing up in Google when you search for site:mysite.com and you can also look for duplicate content with Copyscape).
If you have pages that have been orphaned or if your site's authority has went down Google may not be crawling as deep through your site. If you have a section that needs more link popularity to get indexed don't be afraid to point link popularity at that section instead of trying to point more at the home page. If you add thousands and thousands of pages you may need more link popularity to get it all indexed.
After you solve the problem it still may take a while for many of the supplementals to go away. As long as the number of supplementals is not growing, your content is unique, and Google is ranking your site well across a broad set of keywords then supplementals are probably nothing big to worry about.