Blogger
We know that having a healthy and well-performing website is important to you. To keep you informed about your site's status Webmaster Tools will now automatically send you a notification email if there are critical or important issues that we detect with your site. Google will only send you email for issues that we think have significant impact on your site's health or search performance which have clear actions that you can take to address. For example, Google will email you if we detect mailware on your site or see a significant increase in errors while crawling your site.
For most sites these kinds of issues will occur rarely. If your site does happen to have an issue Google cap the number of emails Google send over a certain period of time to avoid flooding your inbox. If you don't want to receive any email from Webmaster Tools you can change your email delivery preferences at https://www.google.com/webmasters/tools/preferences.
We hope that you find this change a useful way to stay up-to-date on critical and important issues regarding your site's health. If you'd like more information about Webmaster Tools and building Google-friendly websites please visit http://www.google.com/webmasters.
Technical Guidelines
Use a text browser such as Lynx to examine your site, because most search engine spiders see your site much as Lynx would. If fancy features such as JavaScript, cookies, session IDs, frames, DHTML, or Flash keep you from seeing all of your site in a text browser, then search engine spiders may have trouble crawling your site. Allow search bots to crawl your sites without session IDs or arguments that track their path through the site. These techniques are useful for tracking individual user behavior, but the access pattern of bots is entirely different. Using these techniques may result in incomplete indexing of your site, as bots may not be able to eliminate URLs that look different but actually point to the same page. Make sure your web server supports the If-Modified-Since HTTP header. This feature allows your web server to tell Google whether your content has changed since we last crawled your site. Supporting this feature saves you bandwidth and overhead. Make use of the robots.txt file on your web server. This file tells crawlers which directories can or cannot be crawled. Make sure it's current for your site so that you don't accidentally block the Googlebot crawler. Visit http://code.google.com/web/controlcrawlindex/docs/faq.html to learn how to instruct robots when they visit your site. You can test your robots.txt file to make sure you're using it correctly with the robots.txt analysis tool available in Google Webmaster Tools.
Make reasonable efforts to ensure that advertisements do not affect search engine rankings. For example, Google's AdSense ads and DoubleClick links are blocked from being crawled by a robots.txt file. If your company buys a content management system, make sure that the system creates pages and links that search engines can crawl. Use robots.txt to prevent crawling of search results pages or other auto-generated pages that don't add much value for users coming from search engines. Test your site to make sure that it appears correctly in different browsers. Monitor your site's performance and optimize load times. Google's goal is to provide users with the most relevant results and a great user experience. Fast sites increase user satisfaction and improve the overall quality of the web (especially for those users with slow Internet connections), and we hope that as webmasters improve their sites, the overall speed of the web will improve.
Google strongly recommends that all webmasters regularly monitor site performance using Page Speed, YSlow, WebPagetest, or other tools. For more information, tools, and resources, see Let's Make The Web Faster. In addition, the Site Performance tool in Webmaster Tools shows the speed of your website as experienced by users around the world.
Quality guidelines
These quality guidelines cover the most common forms of deceptive or manipulative behavior, but Google may respond negatively to other misleading practices not listed here. It's not safe to assume that just because a specific deceptive technique isn't included on this page, Google approves of it. Webmasters who spend their energies upholding the spirit of the basic principles will provide a much better user experience and subsequently enjoy better ranking than those who spend their time looking for loopholes they can exploit. If you believe that another site is abusing Google's quality guidelines, please let us know by filing a spam report. Google prefers developing scalable and automated solutions to problems, so we attempt to minimize hand-to-hand spam fighting. While we may not take manual action in response to every report, spam reports are prioritized based on user impact, and in some cases may lead to complete removal of a spammy site from Google's search results. Not all manual actions result in removal, however. Even in cases where we take action on a reported site, the effects of these actions may not be obvious. Quality guidelines - basic principles Make pages primarily for users, not for search engines. Don't deceive your users. Avoid tricks intended to improve search engine rankings. A good rule of thumb is whether you'd feel comfortable explaining what you've done to a website that competes with you, or to a Google employee. Another useful test is to ask, "Does this help my users? Would I do this if search engines didn't exist?" Think about what makes your website unique, valuable, or engaging.
Make your website stand out from others in your field. Quality guidelines - specific guidelines Avoid the following techniques: Automatically generated content Participating in link schemes Cloaking Sneaky redirects Hidden text or links Doorway pages Scraped content Participating in affiliate programs without adding sufficient value Loading pages with irrelevant keywords Creating pages with malicious behavior, such as phishing or installing viruses, trojans, or other badware Abusing rich snippets markup Sending automated queries to Google Engage in good practices like the following: Monitoring your site for hacking and removing hacked content as soon as it appears Preventing and removing user-generated spam on your site
(Source Google Webmaster Tools)
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