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salam every one, this is a topic from google web master centrale blog: If you're planning to be at Search Engine Strategies London February 13-15, stop by and say hi to one of the many Googlers who will be there. I'll be speaking on Wednesday at the Successful Site Architecture panel and thought I'd offer up some tips for building crawlable sites for those who can't attend.

Make sure visitors and search engines can access the content

• Check the Crawl errors section of webmaster tools for any pages Googlebot couldn't access due to server or other errors. If Googlebot can't access the pages, they won't be indexed and visitors likely can't access them either.
• Make sure your robots.txt file doesn't accidentally block search engines from content you want indexed. You can see a list of the files Googlebot was blocked from crawling in webmaster tools. You can also use our robots.txt analysis tool to make sure you're blocking and allowing the files you intend.
• Check the Googlebot activity reports to see how long it takes to download a page of your site to make sure you don't have any network slowness issues.
• If pages of your site require a login and you want the content from those pages indexed, ensure you include a substantial amount of indexable content on pages that aren't behind the login. For instance, you can put several content-rich paragraphs of an article outside the login area, with a login link that leads to the rest of the article.
• How accessible is your site? How does it look in mobile browsers and screen readers? It's well worth testing your site under these conditions and ensuring that visitors can access the content of the site using any of these mechanisms.

Make sure your content is viewable

• Check out your site in a text-only browser or view it in a browser with images and Javascript turned off. Can you still see all of the text and navigation?
• Ensure the important text and navigation in your site is in HTML, not in images, and make sure all images have ALT text that describe them.
• If you use Flash, use it only when needed. Particularly, don't put all of the text from your site in Flash. An ideal Flash-based site has pages with HTML text and Flash accents. If you use Flash for your home page, make sure that the navigation into the site is in HTML.

Be descriptive

• Make sure each page has a unique title tag and meta description tag that aptly describe the page.
• Make sure the important elements of your pages (for instance, your company name and the main topic of the page) are in HTML text.
• Make sure the words that searchers will use to look for you are on the page.

Keep the site crawlable

• If possible, avoid frames. Frame-based sites don't allow for unique URLs for each page, which makes indexing each page separately problematic.
• Ensure the server returns a 404 status code for pages that aren't found. Some servers are configured to return a 200 status code, particularly with custom error messages and this can result in search engines spending time crawling and indexing non-existent pages rather than the valid pages of the site.
• Avoid infinite crawls. For instance, if your site has an infinite calendar, add a nofollow attribute to links to dynamically-created future calendar pages. Each search engine may interpret the nofollow attribute differently, so check with the help documentation for each. Alternatively, you could use the nofollow meta tag to ensure that search engine spiders don't crawl any outgoing links on a page, or use robots.txt to prevent search engines from crawling URLs that can lead to infinite loops.
• If your site uses session IDs or cookies, ensure those are not required for crawling.
• If your site is dynamic, avoid using excessive parameters and use friendly URLs when you can. Some content management systems enable you to rewrite URLs to friendly versions.

See our tips for creating a Google-friendly site and webmaster guidelines for more information on designing your site for maximum crawlability and usability.

If you will be at SES London, I'd love for you to come by and hear more. And check out the other Googlers' sessions too:

Tuesday, February 13th

Auditing Paid Listings & Clickfraud Issues 10:45 - 12:00
Shuman Ghosemajumder, Business Product Manager for Trust & Safety

Wednesday, February 14th

A Keynote Conversation 9:00 - 9:45
Matt Cutts, Software Engineer

Successful Site Architecture 10:30 - 11:45
Vanessa Fox, Product Manager, Webmaster Central

Google University 12:45 - 1:45

Converting Visitors into Buyers 2:45 - 4:00
Brian Clifton, Head of Web Analytics, Google Europe

Search Advertising Forum 4:30 - 5:45
David Thacker, Senior Product Manager

Thursday, February 15th

Meet the Crawlers 9:00 - 10:15
Dan Crow, Product Manager

Web Analytics and Measuring Successful Overview 1:15 - 2:30
Brian Clifton, Head of Web Analytics, Google Europe

Search Advertising Clinic 1:15 - 2:30
Will Ashton, Retail Account Strategist

Site Clinic 3:00 - 4:15
Sandeepan Banerjee, Sr. Product Manager, Indexing

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: Posted by Susan Moskwa, Webmaster Trends Analyst

Our search quality and Webmaster Central teams love helping webmasters solve problems. But since we can't be in all places at all times answering all questions, we also try hard to show you how to help yourself. We put a lot of work into providing documentation and blog posts to answer your questions and guide you through the data and tools we provide, and we're constantly looking for ways to improve the visibility of that information.

While I always encourage people to search our Help Center and blog for answers, there are a few articles in particular to which I'm constantly referring people. Some are recent and some are buried in years' worth of archives, but each is worth a read:

1. Googlebot can't access my website
   Web hosters seem to be getting more aggressive about blocking spam bots and aggressive crawlers from their servers, which is generally a good thing; however, sometimes they also block Googlebot without knowing it. If you or your hoster are "allowing" Googlebot through by whitelisting Googlebot IP addresses, you may still be blocking some of our IPs without knowing it (since our full IP list isn't public, for reasons explained in the post). In order to be sure you're allowing Googlebot access to your site, use the method in this blog post to verify whether a crawler is Googlebot.
2. URL blocked by robots.txt
   Sometimes the web crawl section of Webmaster Tools reports a URL as "blocked by robots.txt", but your robots.txt file doesn't seem to block crawling of that URL. Check out this list of troubleshooting tips, especially the part about redirects. This thread from our Help Group also explains why you may see discrepancies between our web crawl error reports and our robots.txt analysis tool.
3. Why was my URL removal request denied?
   (Okay, I'm cheating a little: this one is a Help Center article and not a blog post.) In order to remove a URL from Google search results you need to first put something in place that will prevent Googlebot from simply picking that URL up again the next time it crawls your site. This may be a 404 (or 410) status code, a noindex meta tag, or a robots.txt file, depending on what type of removal request you're submitting. Follow the directions in this article and you should be good to go.
4. Flash best practices
   Flash continues to be a hot topic for webmasters interested in making visually complex content accessible to search engines. In this post Bergy, our resident Flash expert, outlines best practices for working with Flash.
5. The supplemental index
   The "supplemental index" was a big topic of conversation in 2007, and it seems some webmasters are still worried about it. Instead of worrying, point your browser to this post on how we now search our entire index for every query.
6. Duplicate content
   Duplicate content—another perennial concern of webmasters. This post talks in detail about duplicate content caused by URL parameters, and also references Adam's previous post on deftly dealing with duplicate content, which gives lots of good suggestions on how to avoid or mitigate problems caused by duplicate content.
7. Sitemaps FAQs
   This post answers the most frequent questions we get about Sitemaps. And I'm not just saying it's great because I posted it. :-)

Sometimes, knowing how to find existing information is the biggest barrier to getting a question answered. So try searching our blog, Help Center and Help Group next time you have a question, and please let us know if you can't find a piece of information that you think should be there!

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