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salam every one, this is a topic from google web master centrale blog:

When Google originally introduced Supplemental Results in 2003, our main web index had billions of web pages. The supplemental index made it possible to index even more web pages and, just like our main web index, make this content available when generating relevant search results for user queries. This was especially useful for queries that did not return many results from the main web index, and for these the supplemental index allowed us to query even more web pages. The fewer constraints we're able to place on sites we crawl for the supplemental index means that web pages that are not in the main web index could be included in the supplemental. These are often pages with lower PageRank or those with more complex URLs. Thus the supplemental index (read more - and here's Matt's talk about it on video) serves a very important purpose: to index as much of the relevant content that we crawl as possible.

The changes we make must focus on improving the search experience for our users. Since 2006, we've completely overhauled the system that crawls and indexes supplemental results. The current system provides deeper and more continuous indexing. Additionally, we are indexing URLs with more parameters and are continuing to place fewer restrictions on the sites we crawl. As a result, Supplemental Results are fresher and more comprehensive than ever. We're also working towards showing more Supplemental Results by ensuring that every query is able to search the supplemental index, and expect to roll this out over the course of the summer.

The distinction between the main and the supplemental index is therefore continuing to narrow. Given all the progress that we've been able to make so far, and thinking ahead to future improvements, we've decided to stop labeling these URLs as "Supplemental Results." Of course, you will continue to benefit from Google's supplemental index being deeper and fresher.this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
salam every one, this is a topic from google web master centrale blog: Webmaster level: All

Today we’re making a change to the way we categorize link data in Webmaster Tools. As you know, Webmaster Tools lists links pointing to your site in two separate categories: links coming from other sites, and links from within your site. Today’s update won’t change your total number of links, but will hopefully present your backlinks in a way that more closely aligns with your idea of which links are actually from your site vs. from other sites.

You can manage many different types of sites in Webmaster Tools: a plain domain name (example.com), a subdomain (www.example.com or cats.example.com), or a domain with a subfolder path (www.example.com/cats/ or www.example.com/users/catlover/). Previously, only links that started with your site’s exact URL would be categorized as internal links: so if you entered www.example.com/users/catlover/ as your site, links from www.example.com/users/catlover/profile.html would be categorized as internal, but links from www.example.com/users/ or www.example.com would be categorized as external links. This also meant that if you entered www.example.com as your site, links from example.com would be considered external because they don’t start with the same URL as your site (they don’t contain www).

Most people think of example.com and www.example.com as the same site these days, so we’re changing it such that now, if you add either example.com or www.example.com as a site, links from both the www and non-www versions of the domain will be categorized as internal links. We’ve also extended this idea to include other subdomains, since many people who own a domain also own its subdomains—so links from cats.example.com or pets.example.com will also be categorized as internal links for www.example.com.

Links for www.google.comExternal linksInternal links
Previously categorized as...www.example.com/
www.example.org/stuff.html
scholar.google.com/
sketchup.google.com/
google.com/
www.google.com/
www.google.com/stuff.html
www.google.com/support/webmasters/
Now categorized as...www.example.com/
www.example.org/stuff.html
scholar.google.com/
sketchup.google.com/
google.com/
www.google.com/
www.google.com/stuff.html
www.google.com/support/webmasters/

If you own a site that’s on a subdomain (such as www..matrixar.com) or in a subfolder (www.google.com/support/webmasters/) and don’t own the root domain, you’ll still only see links from URLs starting with that subdomain or subfolder in your internal links, and all others will be categorized as external links. We’ve made a few backend changes so that these numbers should be even more accurate for you.

Note that, if you own a root domain like example.com or www.example.com, your number of external links may appear to go down with this change; this is because, as described above, some of the URLs we were previously classifying as external links will have moved into the internal links report. Your total number of links (internal + external) should not be affected by this change.

As always, drop us a comment or join our Webmaster Help Forum if you have questions!

this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
Seo Master present to you:

You may have seen the post on the Google Blog about All for Good, the new site that makes it easy to find and share volunteer activities within the United States. The site was built collaboratively by Google and several partners. We're especially proud that it was built using 100% open source Python code. All for Good's first release includes both gadgets and a free API, making it even easier for casual developers to build applications and embed All for Good listings in their own apps and sites.

If you're interested in seeing your software talents dedicated to community service, check out the API documentation, our Getting Started Guide and the complete source code for the core engine. We're especially looking forward to see what applications the developer community will create for mobile platforms and for Facebook. Happy Hacking!

by Guido van Rossum, Software Engineering Team2013, By: Seo Master
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