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Google Webmaster Central Blog
Official news on crawling and indexing sites for the Google index.

  • Helping webmasters re-secure their sites
    (Cross-posted from the Google Security Blog.)
    Every week, over 10 million users encounter harmful websites that deliver malware and scams. Many of these sites are compromised personal blogs or small business pages that have fallen victim due to a weak password or outdated software. Safe Browsing and Google Search protect visitors from dangerous content by displaying browser warnings and labeling search results with 'this site may harm your computer'. While this helps keep users safe in the moment, the compromised site remains a problem that needs to be fixed.

    Unfortunately, many webmasters for compromised sites are unaware anything is amiss. Worse yet, even when they learn of an incident, they may lack the security expertise to take action and address the root cause of compromise. Quoting one webmaster from a survey we conducted, “our daily and weekly backups were both infected” and even after seeking the help of a specialist, after “lots of wasted hours/days” the webmaster abandoned all attempts to restore the site and instead refocused his efforts on “rebuilding the site from scratch”.

    In order to find the best way to help webmasters clean-up from compromise, we recently teamed up with the University of California, Berkeley to explore how to quickly contact webmasters and expedite recovery while minimizing the distress involved. We’ve summarized our key lessons below. The full study, which you can read here, was recently presented at the International World Wide Web Conference.

    When Google works directly with webmasters during critical moments like security breaches, we can help 75% of webmasters re-secure their content. The whole process takes a median of 3 days. This is a better experience for webmasters and their audience.
    How many sites get compromised?

    Number of freshly compromised sites Google detects every week.

    Over the last year Google detected nearly 800,000 compromised websites—roughly 16,500 new sites every week from around the globe. Visitors to these sites are exposed to low-quality scam content and malware via drive-by downloads. While browser and search warnings help protect visitors from harm, these warnings can at times feel punitive to webmasters who learn only after-the-fact that their site was compromised. To balance the safety of our users with the experience of webmasters, we set out to find the best approach to help webmasters recover from security breaches and ultimately reconnect websites with their audience.
    Finding the most effective ways to aid webmaster

    1. Getting in touch with webmasters: One of the hardest steps on the road to recovery is first getting in contact with webmasters. We tried three notification channels: email, browser warnings, and search warnings. For webmasters who proactively registered their site with Search Console, we found that email communication led to 75% of webmasters re-securing their pages. When we didn’t know a webmaster’s email address, browser warnings and search warnings helped 54% and 43% of sites clean up respectively.
    2. Providing tips on cleaning up harmful content: Attackers rely on hidden files, easy-to-miss redirects, and remote inclusions to serve scams and malware. This makes clean-up increasingly tricky. When we emailed webmasters, we included tips and samples of exactly which pages contained harmful content. This, combined with expedited notification, helped webmasters clean up 62% faster compared to no tips—usually within 3 days.
    3. Making sure sites stay clean: Once a site is no longer serving harmful content, it’s important to make sure attackers don’t reassert control. We monitored recently cleaned websites and found 12% were compromised again in 30 days. This illustrates the challenge involved in identifying the root cause of a breach versus dealing with the side-effects.
    Making security issues less painful for webmasters—and everyone

    We hope that webmasters never have to deal with a security incident. If you are a webmaster, there are some quick steps you can take to reduce your risk. We’ve made it easier to receive security notifications through Google Analytics as well as through Search Console. Make sure to register for both services. Also, we have laid out helpful tips for updating your site’s software and adding additional authentication that will make your site safer.

    If you’re a hosting provider or building a service that needs to notify victims of compromise, understand that the entire process is distressing for users. Establish a reliable communication channel before a security incident occurs, make sure to provide victims with clear recovery steps, and promptly reply to inquiries so the process feels helpful, not punitive.

    As we work to make the web a safer place, we think it’s critical to empower webmasters and users to make good security decisions. It’s easy for the security community to be pessimistic about incident response being ‘too complex’ for victims, but as our findings demonstrate, even just starting a dialogue can significantly expedite recovery.
    Posted by Kurt Thomas and Yuan Niu, Spam & Abuse Research


  • No More Deceptive Download Buttons
    (Cross-posted from the Google Security Blog.)
    In November, we announced that Safe Browsing would protect you from social engineering attacks - deceptive tactics that try to trick you into doing something dangerous, like installing unwanted software or revealing your personal information (for example, passwords, phone numbers, or credit cards). You may have encountered social engineering in a deceptive download button, or an image ad that falsely claims your system is out of date. Today, we’re expanding Safe Browsing protection to protect you from such deceptive embedded content, like social engineering ads.
    Consistent with the social engineering policy we announced in November, embedded content (like ads) on a web page will be considered social engineering when they either:

    • Pretend to act, or look and feel, like a trusted entity — like your own device or browser, or the website itself. 
    • Try to trick you into doing something you’d only do for a trusted entity — like sharing a password or calling tech support.

    Below are some examples of deceptive content, shown via ads:
    This image claims that your software is out-of-date to trick you into clicking “update”. 

    This image mimics a dialogue from the FLV software developer -- but it does not actually originate from this developer.

    These buttons seem like they will produce content that relate to the site (like a TV show or sports video stream) by mimicking the site’s look and feel. They are often not distinguishable from the rest of the page.

    Our fight against unwanted software and social engineering is still just beginning. We'll continue to improve Google's Safe Browsing protection to help more people stay safe online.

    Will my site be affected?

    If visitors to your web site consistently see social engineering content, Google Safe Browsing may warn users when they visit the site. If your site is flagged for containing social engineering content, you should troubleshoot with Search Console. Check out our social engineering help for webmasters.
    Posted by Lucas Ballard, Safe Browsing Team


  • Continuing to make the web more mobile friendly
    Getting good, relevant answers when you search shouldn’t depend on what device you’re using. You should get the best answer possible, whether you’re on a phone, desktop or tablet. Last year, we started using mobile-friendliness as a ranking signal on mobile searches. Today we’re announcing that beginning in May, we’ll start rolling out an update to mobile search results that increases the effect of the ranking signal to help our users find even more pages that are relevant and mobile-friendly.

    If you've already made your site mobile-friendly, you will not be impacted by this update. If you need support with your mobile-friendly site, we recommend checking out the Mobile-Friendly Test and the Webmaster Mobile Guide, both of which provide guidance on how to improve your mobile site. And remember, the intent of the search query is still a very strong signal — so even if a page with high quality content is not mobile-friendly, it could still rank well if it has great, relevant content.

    If you have any questions, please go to the Webmaster help forum.

    Posted by Klemen Kloboves, Software Engineer


  • Updating the smartphone user-agent of Googlebot
    Update, 20/04/2016: This change is now live

    As technology on the web changes, we periodically update the user-agents we use for Googlebot. Next month, we will be updating the smartphone user-agent of Googlebot:


    Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
    (Googlebot smartphone user-agent starting from April 18, 2016)

    Today, we use the following smartphone user-agent for Googlebot:


    Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
    (Current Googlebot smartphone user-agent)

    We’re updating the user-agent string so that our renderer can better understand pages that use newer web technologies. Our renderer evolves over time and the user-agent string indicates that that it is becoming more similar to Chrome than Safari. To make sure your site can be viewed properly by a wide range of users and browsers, we recommend using feature detection and progressive enhancement.

    Our evaluation suggests that this user-agent change should have no effect on 99% of sites. The most common reason a site might be affected is if it specifically looks for a particular Googlebot user-agent string. User-agent sniffing for Googlebot is not recommended and is considered to be a form of cloaking. Googlebot should be treated like any other browser.

    If you believe your site may be affected by this update, we recommend checking your site with the Fetch and Render Tool in Search Console (which has been updated with the new user-agent string) or by changing the user-agent string in Developer Tools in your browser (for example, via Chrome Device Mode). If you have any questions, we’re always happy to answer them in our Webmaster help forums.

    Posted by Katsuaki Ikegami, Software Engineer


  • Best practices for bloggers reviewing free products they receive from companies

    As a form of online marketing, some companies today will send bloggers free products to review or give away in return for a mention in a blogpost. Whether you’re the company supplying the product or the blogger writing the post, below are a few best practices to ensure that this content is both useful to users and compliant with Google Webmaster Guidelines.

    1. Use the nofollow tag where appropriate

      Links that pass PageRank in exchange for goods or services are against Google guidelines on link schemes. Companies sometimes urge bloggers to link back to:
      1. the company’s site
      2. the company’s social media accounts
      3. an online merchant’s page that sells the product
      4. a review service’s page featuring reviews of the product
      5. the company’s mobile app on an app store
      Bloggers should use the nofollow tag on all such links because these links didn’t come about organically (i.e., the links wouldn’t exist if the company hadn’t offered to provide a free good or service in exchange for a link). Companies, or the marketing firms they’re working with, can do their part by reminding bloggers to use nofollow on these links.
    2. Disclose the relationship

      Users want to know when they’re viewing sponsored content. Also, there are laws in some countries that make disclosure of sponsorship mandatory. A disclosure can appear anywhere in the post; however, the most useful placement is at the top in case users don’t read the entire post.
    3. Create compelling, unique content

      The most successful blogs offer their visitors a compelling reason to come back. If you're a blogger you might try to become the go-to source of information in your topic area, cover a useful niche that few others are looking at, or provide exclusive content that only you can create due to your unique expertise or resources.

    For more information, please drop by our Google Webmaster Central Help Forum.

    Posted by the Google Webspam Team


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