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  4. Meta NoIndex tag and Robots Disallow

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Meta NoIndex tag and Robots Disallow

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  • bjs2010
    bjs2010 last edited by May 14, 2013, 6:13 AM

    Hi all,

    I hope you can spend some time to answer my first of a few questions 🙂

    We are running a Magento site - layered/faceted navigation nightmare has created thousands of duplicate URLS!

    Anyway, during my process to tackle the issue, I disallowed in Robots.txt anything in the querystring that was not a p (allowed this for pagination).

    After checking some pages in Google, I did a site:www.mydomain.com/specificpage.html and a few duplicates came up along with the original with
    "There is no information about this page because it is blocked by robots.txt"

    So I had added in Meta Noindex, follow on all these duplicates also but I guess it wasnt being read because of Robots.txt.

    So coming to my question.

    1. Did robots.txt block access to these pages? If so, were these already in the index and after disallowing it with robots, Googlebot could not read Meta No index?

    2. Does Meta Noindex Follow on pages actually help Googlebot decide to remove these pages from index?

    I thought Robots would stop and prevent indexation? But I've read this:
    "Noindex is a funny thing, it actually doesn’t mean “You can’t index this”, it means “You can’t show this in search results”. Robots.txt disallow means “You can’t index this” but it doesn’t mean “You can’t show it in the search results”.

    I'm a bit confused about how to use these in both preventing duplicate content in the first place and then helping to address dupe content once it's already in the index.

    Thanks!

    B

    1 Reply Last reply Reply Quote 0
    • ThompsonPaul
      ThompsonPaul @bjs2010 last edited by May 15, 2013, 10:18 PM May 15, 2013, 10:18 PM

      There's no real way to estimate how long the re-crawl will take, Ben. You can get a bit of an idea by looking at the crawl rate reported in Google Webmaster Tools.

      Yes, asking for a page fetch then submitting with linked pages for each of the main website sections can help speed up the crawl discovery. In addition, make sure you've submitted a current sitemap and it's getting found correctly (also reported in GWT) You should also do the same in Bing Webmaster Tools. Too many sites forget about optimizing for Bing - even if it's only 20% of Google's traffic, there's no point throwing it away.

      Lastly, earning some new links to different sections of the site is another great signal. This can often be effectively & quickly done using social media - especially Google+ as it gets crawled very quickly.

      As far as your other question - yes, once you get the unwanted URLs out of the index, you can add the robots.txt disallow back in to optimise your crawl budget. I would strongly recommend you leave the meta-robots no-index tag in place though as a "belt & suspenders" approach to keep pages linking into those unwanted pages from triggering a re-indexing. It's OK to have both in place as long as the de-indexing has already been accomplished, as we've discussed.

      Hope that answer your questions?

      Paul

      1 Reply Last reply Reply Quote 0
      • bjs2010
        bjs2010 @bjs2010 last edited by May 15, 2013, 5:24 AM May 15, 2013, 5:24 AM

        So once Google has started to see the meta-noindex and is slowly deindexing pages, once that is done, I would like to block it from crawling them with a robots.txt to conserve my crawl budget.

        But, there are still internal links on the site that point to these URL´s - would they get back into the index in this case?

        1 Reply Last reply Reply Quote 0
        • bjs2010
          bjs2010 @ThompsonPaul last edited by May 14, 2013, 7:23 AM May 14, 2013, 7:23 AM

          Hi Paul,

          Thank you for your detailed answer - so I'm not going crazy 🙂

          I did try with canonicals but then realized they are more of a suggestion as opposed to a directive and I am still correcting a lot of dupe content and 404's so I am imagining that Google view's the site as "these guys don't know what they are doing' so may have ignored the canonical suggestion.

          So what I have done is remove the robots block on the pages I want de-indexed and add in meta noindex, follow on these pages - From what you are saying, they should naturally de-index, after which, I will put the robots.txt block back on to keep my crawl budget spent on better areas of the site.

          How long in your opinion can it take for Googlebot to de-index the pages? Can I help it along at all to speed up? Fetch page and linking pages as Googlebot?

          Thanks again,

          Ben

          bjs2010 ThompsonPaul 2 Replies Last reply May 15, 2013, 10:18 PM Reply Quote 0
          • ThompsonPaul
            ThompsonPaul last edited by May 15, 2013, 5:22 AM May 14, 2013, 7:05 AM

            You're right to be confused, B. The terminology is unfortunate and misleading.

            To answer your questions

            1. Yes

            2. Yes.

            A disallow in robots.txt does nothing to remove already-indexed pages. That's not its purpose. Its only purpose is to tell the search crawlers not to waste their time crawling those pages. Even if pages have been blocked in robots, they will remain in the index if already there. Even if never crawled, and blocked in robots.txt, they can still end up indexed if some other indexed page links to them and the crawlers find those pages by following links. Again, nothing in a robots.txt disallow tells the engines to remove a page from the index, just not to waste time crawling it.

            Put another way, the robots.txt disallow directive only disallows crawling - it says nothing about what to do if the page gets into the index in other ways.

            The meta-robots no-index tag however explicitly states to the crawler "if you arrive at this page, do not add it to the index. If it is already in the index, remove it".

            And yea - as you suspected - if pages are blocked in robots.txt, the crawler obeys and doesn't visit those pages So it can't discover the no-index command to drop them from the index. Thus the only way a page could get dropped is if a crawler followed a link from an external site and discovered the page that way. A very inefficient way of trying to get all those pages out of the index.

            Bottom line - robots.txt is never the correct tool to deal with duplicate content issues. It's sole purpose is to keep the crawlers from wasting time on unimportant pages so they can spend more time finding (and therefore indexing) more important pages.

            The three tools for dealing with duplicate content are meta-robots no-index tags in a page header, 301 redirects, and canonical tags. Which one to use depends on the architecture of your site, your intended purpose, and the site's technical limitations.

            Hope that makes sense?

            Paul

            bjs2010 1 Reply Last reply May 14, 2013, 7:23 AM Reply Quote 1
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