Skip to content
    Moz logo Menu open Menu close
    • Products
      • Moz Pro
      • Moz Pro Home
      • Moz Local
      • Moz Local Home
      • STAT
      • Moz API
      • Moz API Home
      • Compare SEO Products
      • Moz Data
    • Free SEO Tools
      • Domain Analysis
      • Keyword Explorer
      • Link Explorer
      • Competitive Research
      • MozBar
      • More Free SEO Tools
    • Learn SEO
      • Beginner's Guide to SEO
      • SEO Learning Center
      • Moz Academy
      • SEO Q&A
      • Webinars, Whitepapers, & Guides
    • Blog
    • Why Moz
      • Digital Marketers
      • Agency Solutions
      • Enterprise Solutions
      • Small Business Solutions
      • The Moz Story
      • New Releases
    • Log in
    • Log out
    • Products
      • Moz Pro

        Your all-in-one suite of SEO essentials.

      • Moz Local

        Raise your local SEO visibility with complete local SEO management.

      • STAT

        SERP tracking and analytics for enterprise SEO experts.

      • Moz API

        Power your SEO with our index of over 44 trillion links.

      • Compare SEO Products

        See which Moz SEO solution best meets your business needs.

      • Moz Data

        Power your SEO strategy & AI models with custom data solutions.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • Free SEO Tools
      • Domain Analysis

        Get top competitive SEO metrics like DA, top pages and more.

      • Keyword Explorer

        Find traffic-driving keywords with our 1.25 billion+ keyword index.

      • Link Explorer

        Explore over 40 trillion links for powerful backlink data.

      • Competitive Research

        Uncover valuable insights on your organic search competitors.

      • MozBar

        See top SEO metrics for free as you browse the web.

      • More Free SEO Tools

        Explore all the free SEO tools Moz has to offer.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • Learn SEO
      • Beginner's Guide to SEO

        The #1 most popular introduction to SEO, trusted by millions.

      • SEO Learning Center

        Broaden your knowledge with SEO resources for all skill levels.

      • On-Demand Webinars

        Learn modern SEO best practices from industry experts.

      • How-To Guides

        Step-by-step guides to search success from the authority on SEO.

      • Moz Academy

        Upskill and get certified with on-demand courses & certifications.

      • MozCon

        Save on Early Bird tickets and join us in London or New York City

      Unlock flexible pricing & new endpoints
      Moz API

      Unlock flexible pricing & new endpoints

      Find your plan
    • Blog
    • Why Moz
      • Digital Marketers

        Simplify SEO tasks to save time and grow your traffic.

      • Small Business Solutions

        Uncover insights to make smarter marketing decisions in less time.

      • Agency Solutions

        Earn & keep valuable clients with unparalleled data & insights.

      • Enterprise Solutions

        Gain a competitive edge in the ever-changing world of search.

      • The Moz Story

        Moz was the first & remains the most trusted SEO company.

      • New Releases

        Get the scoop on the latest and greatest from Moz.

      Surface actionable competitive intel
      New Feature

      Surface actionable competitive intel

      Learn More
    • Log in
      • Moz Pro
      • Moz Local
      • Moz Local Dashboard
      • Moz API
      • Moz API Dashboard
      • Moz Academy
    • Avatar
      • Moz Home
      • Notifications
      • Account & Billing
      • Manage Users
      • Community Profile
      • My Q&A
      • My Videos
      • Log Out

    The Moz Q&A Forum

    • Forum
    • Questions
    • Users
    • Ask the Community

    Welcome to the Q&A Forum

    Browse the forum for helpful insights and fresh discussions about all things SEO.

    1. Home
    2. Research & Trends
    3. Algorithm Updates
    4. Sub-domain with spammy content and links: Any impact on main website rankings?

    Moz Q&A is closed.

    After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.

    Sub-domain with spammy content and links: Any impact on main website rankings?

    Algorithm Updates
    3
    2
    653
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as question
    Log in to reply
    This topic has been deleted. Only users with question management privileges can see it.
    • vtmoz
      vtmoz last edited by

      Hi all,

      One of our sub-domains is forums. Our users will be discussing about our product and many related things. But some of the users in forum are adding a lot of spammy content everyday. I just wonder whether this scenario is ruining our ranking efforts of main website? A sub domain with spammy content really kills the ranking of main website?

      Thanks

      1 Reply Last reply Reply Quote 0
      • MikeTek
        MikeTek last edited by

        Hi vtmoz,

        I see you have posted an updated question on this issue separately - regarding the spammy inbound links pointing to this subdomain. That is a more likely problem for your site.

        That said, the more spam that shows up on that subdomain, the more likely Google is to seeing your site as part of a "bad neighborhood" of the web, and this could risk the organic visibility of your root domain.

        There is no documentation on "how much spammy content is too much" - generally, some spammy content on a subdomain doesn't negatively impact the entire domain. However I have seen cases where an entire domain was negatively impacted by a very large number of spammy pages on various subdomains. It's a matter of scale.

        If your rankings and traffic on your primary domain are important, my advice would be to mitigate the risk by either policing the content on your forum subdomains by bringing in admins, or shutting down the forums entirely.

        Best,
        Mike

        1 Reply Last reply Reply Quote 1
        • 1 / 1
        • First post
          Last post

        Got a burning SEO question?

        Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


        Start my free trial


        Browse Questions

        Explore more categories

        • Moz Tools

          Chat with the community about the Moz tools.

        • SEO Tactics

          Discuss the SEO process with fellow marketers

        • Community

          Discuss industry events, jobs, and news!

        • Digital Marketing

          Chat about tactics outside of SEO

        • Research & Trends

          Dive into research and trends in the search industry.

        • Support

          Connect on product support and feature requests.

        • See all categories

        Related Questions

        • BFMichael

          Does an EAT score on my YMYL site impact my rankings?

          I've read some conflicting information on YMYL and EAT.  If the Google Quality Raters are out there reviewing YMYL pages and scoring them on EAT, does that site's score have an impact on that page's/site's ranking?

          Algorithm Updates | | BFMichael
          0
        • fenixbazaar

          Very strange, inconsistent and unpredictable Google ranking

          I have been searching through these forums and haven't come across someone that faces the same issue I am. The folks on the Google forums are certain this is an algorithm issue, but I just can't see the logic in that because this appears to be an issue fairly unique to me. I'll take you through what I've gone through. Sorry for it being long. Website URL: https://fenixbazaar.com 1. In early February, I made the switch to https with some small hiccups. Overall however the move was smooth, had redirects all in place, sitemap, indexing was all fine. 2. One night, my organic traffic dropped by almost 100%. All of my top-ranking articles completely disappeared from rank. Top keyword searches were no longer yielding my best performing articles on the front page of results, nor on the last page of results. My pages were still being indexed, but keyword searches weren't delivering my pages in results. I went from 70-100 active users to 0. 3. The next morning, everything was fine. Traffic back up. Top keywords yielding results for my site on the front page. All was back to normal. Traffic shot up. Only problem was the same issue happened that night, and again for the next three nights. Up and down. 4. I had a developer and SEO guy look into my backend to make sure everything was okay. He said there were some redirection issues but nothing that would cause such a significant drop. No errors in Search Console. No warnings. 5. Eventually, the issue stopped and my traffic improved back to where it was. Then everything went great: the site was accepted into Google News, I installed AMP pages perfectly and my traffic boomed for almost 2 weeks. 6. At this point numerous issues with my host provider, price increases, and incredibly outdated cpanel forced me to change hosts. I did without any issues, although I lost a number of articles albeit low-traffic ones in the move. These now deliver 404s and are no longer indexed in the sitemap. 7. After the move there were a number of AMP errors, which I resolved and now I sit at 0 errors. Perfect...or so it seems. 8. Last week I applied for hsts preload and am awaiting submission. My site was in working order and appeared set to get submitted. I applied after I changed hosts. 9. The past 5 days or so has seen good traffic, fantastic traffic to my AMP pages, great Google News tracking, linking from high-authority sites. Good performance all round. 10. I wake up this morning to find 0 active people on my site. I do a Google search and notice my site isn't even the first result whenever I do an actual search for my name. The site doesn't even rank for its own name! My site is still indexed but search results do not yield results for my actual sites. Check Search Console and realised the sitemap had been "processed" yesterday with most pages indexed, which is weird because it was submitted and processed about a week earlier. I resubmitted the sitemap and it appears to have been processed and approved immediately. No changes to search results. 11. All top-ranking content that previously placed in carousal or "Top Stories" in Google News have gone. Top-ranking keywords no longer bring back results with my site: I went through the top 10 ranking keywords for my site, my pages don't appear anywhere in the results, going as far back as page 20 (last page). The pages are still indexed when I check, but simply don't appear in search results. It's happening all over again! Is this an issue any of you have heard of before? Where a site is still being indexed, but has been completely removed from search results, only to return within a few hours? Up and down? I suspect it may be a technical issue, first with the move to https, and now with changing hosts. The fact the sitemap says processed yesterday, suggests maybe it updated and removed the 404s (there were maybe 10), and now Google is attempting to reindexed? Could this be viable? The reason I am skeptical of it being an algorithm issue is because within a matter of hours my articles are ranking again for certain keywords. And this issue has only happened after a change to the site has been applied. Any feedback would be greatly appreciated 🙂

          Algorithm Updates | | fenixbazaar
          0
        • Eyah

          Exact Keywords Domain name

          Hello everyone!, I would love to have your opinion on this matter. I am working on a company e-commerce site; these guys would like to change their domain name AND their company name, so the most logical thing that came to mind was to name the domain after the company name. However, they also bought in the past a domain that have the exact keyword they would like to rank for. I know that keywords in the URL are not as important as they used to be in the past, but nonetheless when I do a Google search for those keywords, 3 domains out of 10 on the first page are slight variations of those same keywords, meaning that they might have a really good domain name (also the other result are government, medical stuff and so on). And, no matter how many times I have read that keywords in the URL are not so important anymore, I still see a lot of sites ranking also because of their domain name (well at least outside the US) So, my question here is: would it be better for them to use the exact match keyword-domain name or should they use their company name for their new site? Or some sort combination of the two? (the keyword-domain that in some way points also to the brand domain). Thanks for your opinions on this; really appreciate it! Cheers

          Algorithm Updates | | Eyah
          0
        • Steplead

          How to use MOZ to improve my website

          Hi, I am new for MOZ, have no idea how to improve my website with the function of MOZ, can anyone share their experience for using MOZ service. the more detail the better! Thanks a lot in advance! John Thanks for helps for everyone, it took me some time to read each answer, and also spend few days to study MOZ. My initial conclusion is the function of MOZ is to promote the idea of SEO, but not provide any specific SEO service for specific website except for some tools and report. So I am missing or misunderstanding MOZ's service, it will be always welcome to help me out by correcting my opinion. Anyway, thanks again for all the time you've given to me, and good to you all! -John.

          Algorithm Updates | | Steplead
          1
        • sanj5050

          How much link juice does a sites homepage pass to inner pages and influence inner page rankings?

          Hi, I have a question regarding the power of internal links and how much link juice they pass, and how they influence search engine ranking positions. If we take the example of an ecommerce store that sells kites. Scenario 1 It can be assumed that it is easier for the kite ecommerce store to earn links to its homepage from writing great content on its blog, as any blogger that will link to the content will likely use the site name, and homepage as anchor text. So if we follow this through, then it can be assumed that there will eventually be a large number of high quality backlinks pointing to the sites homepage from various high authority blogs that love the content being posted on the sites blog. The question is how much link juice does this homepage pass to the category pages, and from the category pages then to the product pages, and what influence does this have on rankings? I ask because I have seen strong ecommerce sites with very strong DA or domain PR but with no backlinks to the product page/category page that are being ranked in the top 10 of search results often, for the respective category and product pages. It therefore leads me to assume that internal links must have a strong determiner on search rankings... Could it therefore also be assumed that a site with a PR of 5 and no links to a specific product page, would rank higher than a site with a PR of 1 but with 100 links pointing to the specific product page? Assuming they were both trying to rank for the same product keyword, and all other factors were equal. Ie. neither of them built spammy links or over optimised anchor text? Scenario 2 Does internal linking work both ways? Whereas in my above example I spoke about the homepage carrying link juice downward to the inner category and product pages. Can a powerful inner page carry link juice upward to category pages and then the homepage. For example, say the blogger who liked the kite stores blog content piece linked directly to the blog content piece from his site and the kite store blog content piece was hosted on www.xxxxxxx.com/blog/blogcontentpiece As authority links are being built to this blog content piece page from other bloggers linking to it, will it then pass link juice up to the main blog category page, and then the kite sites main homepage? And if there is a link with relevant anchor text as part of the blog content piece will this cause the link juice flowing upwards to be stronger? I know the above is quite winded, but I couldn't find anywhere that explains the power of internal linking on SERP's... Look forward to your replies on this....

          Algorithm Updates | | sanj5050
          0
        • thealika

          Will Parked Domain hurt My SEO as Duplicate Content?

          Hello, I have one website (Migration Lawyers) and I have an extra 8 domains Parked so they are basically cloning the content of the site. so if the main site is:  migrationlawyers.co.za and I have an addon domain  migration-lawyers.com  is that good or bad? is there a proper way to redirect the sites, will redirecting (301) subdomains be more effective? Thanks for your Input 🙂 0i8VXqr.png

          Algorithm Updates | | thealika
          0
        • ahw

          Decline in traffic but no change in rankings

          I'm comparing our best search traffic month in 2011 (March) with our current traffic (April)and have seen significant declines in traffic, despite no change in our rankings or even improved rankings for the same terms.  Trying to sort out an explanation. We have been a white-hat SEO site since our inception over 10 years ago.  Our SEO consultant doesn't think we've been affected by any algo changes, at least not to any significant degree. My only explanation for this possibly anomaly is: decrease in the use of the KW terms in search over time (how to determine?) generalized increase in PPC instead of organic search driving traffic possibility that Adv Web Rankings is no longer accurately collecting SERP rankings Does anyone have any other thoughts or considerations that might explain the decline in traffic, despite maintenance or improvement in rankings? Thanks.

          Algorithm Updates | | ahw
          0
        • uwaim2012

          Youtube dofollow link to web site

          Is there still a dofollow link back from a youtube channel to your web site? I filled in the site url in the profile, which in my understanding used to be the single dofollow link back to your web site. However, when I view the page source for the youtube channel it shows up as a nofollow link. Also, in OSE the link does not appear. Has this changed or am I just not doing this correctly?

          Algorithm Updates | | uwaim2012
          0

        Get started with Moz Pro!

        Unlock the power of advanced SEO tools and data-driven insights.

        Start my free trial
        Products
        • Moz Pro
        • Moz Local
        • Moz API
        • Moz Data
        • STAT
        • Product Updates
        Moz Solutions
        • SMB Solutions
        • Agency Solutions
        • Enterprise Solutions
        Free SEO Tools
        • Domain Authority Checker
        • Link Explorer
        • Keyword Explorer
        • Competitive Research
        • Brand Authority Checker
        • Local Citation Checker
        • MozBar Extension
        • MozCast
        Resources
        • Blog
        • SEO Learning Center
        • Help Hub
        • Beginner's Guide to SEO
        • How-to Guides
        • Moz Academy
        • API Docs
        About Moz
        • About
        • Team
        • Careers
        • Contact
        Why Moz
        • Case Studies
        • Testimonials
        Get Involved
        • Become an Affiliate
        • MozCon
        • Webinars
        • Practical Marketer Series
        • MozPod
        Connect with us

        Contact the Help team

        Join our newsletter
        Moz logo
        © 2021 - 2025 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
        • Accessibility
        • Terms of Use
        • Privacy

        Looks like your connection to Moz was lost, please wait while we try to reconnect.