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salam every one, this is a topic from google web master centrale blog: At the recent Search Engine Strategies conference in freezing Chicago, many of us Googlers were asked questions about duplicate content. We recognize that there are many nuances and a bit of confusion on the topic, so we'd like to help set the record straight.

What is duplicate content?
Duplicate content generally refers to substantive blocks of content within or across domains that either completely match other content or are appreciably similar. Most of the time when we see this, it's unintentional or at least not malicious in origin: forums that generate both regular and stripped-down mobile-targeted pages, store items shown (and -- worse yet -- linked) via multiple distinct URLs, and so on. In some cases, content is duplicated across domains in an attempt to manipulate search engine rankings or garner more traffic via popular or long-tail queries.

What isn't duplicate content?
Though we do offer a handy translation utility, our algorithms won't view the same article written in English and Spanish as duplicate content. Similarly, you shouldn't worry about occasional snippets (quotes and otherwise) being flagged as duplicate content.

Why does Google care about duplicate content?
Our users typically want to see a diverse cross-section of unique content when they do searches. In contrast, they're understandably annoyed when they see substantially the same content within a set of search results. Also, webmasters become sad when we show a complex URL (example.com/contentredir?value=shorty-george〈=en) instead of the pretty URL they prefer (example.com/en/shorty-george.htm).

What does Google do about it?
During our crawling and when serving search results, we try hard to index and show pages with distinct information. This filtering means, for instance, that if your site has articles in "regular" and "printer" versions and neither set is blocked in robots.txt or via a noindex meta tag, we'll choose one version to list. In the rare cases in which we perceive that duplicate content may be shown with intent to manipulate our rankings and deceive our users, we'll also make appropriate adjustments in the indexing and ranking of the sites involved. However, we prefer to focus on filtering rather than ranking adjustments ... so in the vast majority of cases, the worst thing that'll befall webmasters is to see the "less desired" version of a page shown in our index.

How can Webmasters proactively address duplicate content issues?

• Block appropriately: Rather than letting our algorithms determine the "best" version of a document, you may wish to help guide us to your preferred version. For instance, if you don't want us to index the printer versions of your site's articles, disallow those directories or make use of regular expressions in your robots.txt file.
• Use 301s: If you have restructured your site, use 301 redirects ("RedirectPermanent") in your .htaccess file to smartly redirect users, the Googlebot, and other spiders.
  
• Be consistent: Endeavor to keep your internal linking consistent; don't link to /page/ and /page and /page/index.htm.
• Use TLDs: To help us serve the most appropriate version of a document, use top level domains whenever possible to handle country-specific content. We're more likely to know that .de indicates Germany-focused content, for instance, than /de or de.example.com.
• Syndicate carefully: If you syndicate your content on other sites, make sure they include a link back to the original article on each syndicated article. Even with that, note that we'll always show the (unblocked) version we think is most appropriate for users in each given search, which may or may not be the version you'd prefer.
• Use the preferred domain feature of webmaster tools: If other sites link to yours using both the www and non-www version of your URLs, you can let us know which way you prefer your site to be indexed.
  
• Minimize boilerplate repetition: For instance, instead of including lengthy copyright text on the bottom of every page, include a very brief summary and then link to a page with more details.
• Avoid publishing stubs: Users don't like seeing "empty" pages, so avoid placeholders where possible. This means not publishing (or at least blocking) pages with zero reviews, no real estate listings, etc., so users (and bots) aren't subjected to a zillion instances of "Below you'll find a superb list of all the great rental opportunities in [insert cityname]..." with no actual listings.
• Understand your CMS: Make sure you're familiar with how content is displayed on your Web site, particularly if it includes a blog, a forum, or related system that often shows the same content in multiple formats.
• Don't worry be happy: Don't fret too much about sites that scrape (misappropriate and republish) your content. Though annoying, it's highly unlikely that such sites can negatively impact your site's presence in Google. If you do spot a case that's particularly frustrating, you are welcome to file a DMCA request to claim ownership of the content and have us deal with the rogue site.

In short, a general awareness of duplicate content issues and a few minutes of thoughtful preventative maintenance should help you to help us provide users with unique and relevant content.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: Written by Sahala Swenson, Webmaster Tools Team

As you know, the queries used to find your website in search results can change over time. Your website content changes, as do the needs of all the busy searchers out there. Whether the queries associated with your site change subtly or dramatically, it's pretty useful to see how they transform over time.

Recognizing this, Top Search Queries in Webmaster Tools now presents historical data and other enhancements. Let's take a closer look:


Up to 6 months of historical data:
Previously we only showed query stats for the last 7 days. Now you can jump between 9 query stats snapshots ranging from now to 6 months ago. Note that the time interval for each of these snapshots is different. For the 7 day, 2 week, and 3 week snapshots, we report the top queries for the previous week. For the 1 to 6 month snapshots, we report statistics for the previous month. And still others of you who log in may notice that you don't have query stats data going back to 6 months ago. We hope to improve that experience in the future. :)

Top query percentages:
You might have noticed a new column in the top query listings. Previously we just ranked your query results and clicks. While useful, this didn't really tell you to what extent one query was ranked higher than another. Now we show what percentage each query result or click represents out of the top 20 queries. This should help you see how well the result or click volume is distributed in the top 20.

Downloads:
Since we're now showing historical data on the Top Search Queries screen, we figured it would be rude to not let you download it all and play with the data yourself (spreadsheet masochists, I'm looking at you). We added a “Download data” link that lets you download all the stats in CSV format. Note that this exports all query stats historical data across all snapshots as well as search types and languages, so you can slice and dice to your satisfaction. The “Download all stats (including subfolders)” link, however, will still only show query stats for your site and sub-folders for the last 7 days.

Freshness:
We've improved data freshness in Webmaster Tools a couple of times in the past, and we've done it again with the new Top Search Queries. Statistics are being now updated constantly. Top query results and clicks may visibly change rank a lot more often now, sometimes daily.


So enough talk. Sign in and play around with the new improvements for yourself. As always we welcome feedback (especially in the form of beer), so feel free to drop us a note in the Webmaster Help Group and let us know what you think.


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

In November, we launched Instant Previews to help users better understand if a particular result was relevant for a their search query. Since launch, our Instant Previews team has been keeping an eye on common complaints and problems related to how pages are rendered for Instant Previews.

When we see issues with preview images, they are frequently due to:

• Blocked resources due to a robots.txt entry
• Cloaking: Erroneous content being served to the Googlebot user-agent
• Poor alternative content when Flash is unavailable

To help webmasters diagnose these problems, we have a new Instant Preview tool in the Labs section of Webmaster Tools (in English only for now).



Here, you can input the URL of any page on your site. We will then fetch the page from your site and try to render it both as it would display in Chrome and through our Instant Preview renderer. Please keep in mind that both of these renders are done using a recent build of Webkit which does not include plugins such as Flash or Silverlight, so it's important to consider the value of providing alternative content for these situations. Alternative content can be helpful to search engines, and visitors to your site without the plugin would benefit as well.

Below the renders, you’ll also see automated feedback on problems our system can detect such as missing or roboted resources. And, in the future, we plan to add more informative and timely feedback to help improve your Instant Previews!

Please direct your questions and feedback to the Webmaster Forum.

Posted by Michael Darweesh, Software Engineerthis is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com