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It is often mentioned in SEO and webmaster discussions, “My site went supplemental” A great discourse took place right on this blog (read the comments) that of course didn’t get a lot of airplay, but had great discoveries.
I can’t take the credit as Halfdeck made the initial observation, but the conclusion is that just because a page is shown as supplemental while doing a site: command in Google doesn’t mean that it isn’t also in the regular index for real live searches.
Thus I’ve coined the term, Supplemental-only , to distinguish those pages that are only supplemental and not in the regular index at all.
The implications of this are not far reaching or even that important but should be considered when analysing a sites status. The site: command is not the only tool you should use to check the health of the sites indexing in Google you’ll have to do some more legwork.
The issue came up in a Digital Point forum discussion about whether or not links on supplemental pages were devalued, where I integrated the supplemental-only theory into the discussion using Matt Cutts site as an example. Quoting only my comments:
All right I’m going to throw a wrench into this whole discussion, pages can be both supplemental and not-supplemental.
Let’s use the Matt Cutts page given before as an example:
http://www.mattcutts.com/blog/seo-ad…ress-releases/
Here’s that page, shown as supplemental in position #903 of the site: command.
http://www.google.com/search?q=site:…start=900&sa=N
Modifying the site: command to “site:mattcutts.com press” we now see the same page in position #2, but not marked supplemental.
http://www.google.com/search?num=100…ss&btnG=Search
or even better a straight google search for “seo advice: clean house” where the pages shows up at #1 out of about 949,000 and not supplemental.
http://www.google.com/search?q=seo+a…006-27,GGGL:en
The conclusion is that by viewing your site: results and seeing supplemental you are not seeing the whole picture, as pages in the supplemental index can also be in the regular index. It has even been said that ALL pages in the regular index are in the supplemental index, however all pages in the supplemental index are not in the regular index.
If you investigate further you’ll see that the cache for both instances are the same.
In order to understand this you must consider what supplemental truly means to Google. It’s just a lower crawl priority assigned to a page. Instead of crawling it daily, or weekly, they’ll crawl it at the much slower pace of the supplemental index crawler. It would make sense that each and every page google considers valuable to be included in their search is assigned a supplemental crawl rate. Some Pages are then assigned a regular index crawl rate.
So the often cited phrase, “My site has gone supplemental” is not true, as the site was always supplemental, it just left the main index.
Long winded I know, but to sum up. Just because you do a site: command and see pages marked as supplemental doesn’t mean that they are only supplemental. You must do further research on that page by:
- Checking the cache date. If it’s 3 months old, then its probably supplemental only.
- Checking for natural search results. Search for terms that the page would probably rank for like a snippet of the page title I did above.
- Refine the site: command to include a keyword that would likely reduce the amount of pages and include the page you are looking at.
All-in-all its a lot of work for no real gain in knowledge. The only real way to keep a page out of the supplemental-only (as I just renamed it) index is to get more links to it, which is something you should be working on anyway.
To address the original question. Links from supplemental pages are still links like any other link, however if it’s truly a supplemental-only page than of course its going to have less weight and be updated less frequently by the very definition of supplemental. But beware of deeming a page supplemental just by looking at the site: command as it doesn’t tell the whole story.
…whew!
I should also add this. It may appear that a link from a supplemental-only page is downgraded because of the nature of supplemental-only pages; they are crawled infrequently. So if you gain a link on supplemental-only page today, google may not crawl that page until June and therefore you won’t get any credit for it until then. So checking the cache date is more of a good indicator of the inherent value of the page than visible PageRank (woefully behind) or even if it has supplemental by it in a site: search.