Cleaning Up User-Generated Spam After a Spam Update

Forums, comment sections, Q&A boards and member profiles can be some of the most valuable pages on a site. Real people ask real questions, and that content often earns links and long-tail traffic. The same open door also lets spammers in. Left alone, a community can fill with casino links, pharma pitches and auto-generated profiles faster than any moderator can read them.

Google treats this as its own category of spam. When a spam update rolls out, or a reviewer issues a manual action, sites with large amounts of unmoderated user content can be affected. Google has run several spam updates in 2026 alone: in March, June, August and a longer one from 24 September to 8 October, according to the Search Status Dashboard.

This guide explains how to audit user-generated content (UGC), clean what is already there, and set up moderation, link attributes and indexing rules so the problem does not return.

Key Takeaways

• Google's spam policies name user-generated spam explicitly, including spammy forum posts, blog comment spam and spammy accounts on open hosting services.
• Start by finding the scale of the problem: spammy profiles, threads and outbound links, and how many are indexed.
• Delete clear spam, noindex low-value or new-user content, and mark links in untrusted content with rel="ugc" or rel="nofollow".
• Prevention matters more than one-off cleanup: moderation queues, account checks, CAPTCHAs and blocklists, as Google recommends.
• Check the Manual Actions report. A manual action needs a reconsideration request; an algorithmic effect does not.

What Google counts as user-generated spam

Google's spam policies define the problem in one line:

“User-generated spam is spammy content added to a site by users through a channel intended for user content.”

— Google Search Central, Spam policies for Google web search

The examples Google lists are spammy accounts on hosting services anyone can register for, spammy posts on forum threads, comment spam on blogs and spammy files uploaded to file hosting platforms. The key point is that you did not write the spam, but you are responsible for what your site publishes. Our overview of Google spam policies covers the other categories, and our guide to how algorithm updates affect forums and UGC sites looks at the wider picture for community sites.

Google also has a dedicated manual action for this. The Manual Actions report describes it as Google having detected spam on your pages submitted by site visitors. If you see that message, the clean-up below is the core of your reconsideration request.

First: manual action or algorithmic effect?

Before you change anything, open the Manual Actions report in Search Console. The answer changes your process:

• Manual action present: clean up, document what you did and request a review. Google says most reconsideration reviews can take several days or weeks.
• No manual action, but traffic fell during a spam update: there is nothing to submit. Clean up, improve moderation and give automated systems time to see the change. Google's spam update documentation says improvements may show once its systems learn over a period of months that the site complies.

Our explainer on algorithmic demotion versus manual action goes deeper, and our manual actions guide lists every type.

Auditing your user-generated content

You cannot clean what you cannot see. Build an inventory of UGC areas and their scale before deleting anything.

Area	What spam usually looks like	How to find it
Member profiles	Empty profiles with a bio link, keyword usernames, bulk sign-ups from similar emails	Export users; filter by zero posts plus a website field
Forum threads	Off-topic promotional posts, copied text, links to casinos, loans or pharma	Keyword searches on post text; outbound link reports
Blog comments	Generic praise with a link, keyword-stuffed author names	Comment export; link counts per comment
File uploads / attachments	PDFs or documents carrying spam links	Storage audit by file type and uploader age
Search or tag pages	Spam keywords appearing in indexed internal search URLs	site: searches with spam terms; Page indexing report

A crawler such as Screaming Frog can list outbound links by domain across UGC directories. Sort by frequency: spam tends to cluster around a few target domains. Searching Google for site:yourdomain.com combined with common spam words (for example "casino" or "viagra") quickly shows what has already been indexed.

Step-by-step cleanup process

1. Stop new spam first. Turn on approval for new accounts or first posts, and add a CAPTCHA or verification step to sign-up. There is no point cleaning while spam keeps arriving.
2. Delete clear spam. Remove accounts, posts and files that exist only to promote links. Let deleted URLs return 404 or 410; do not redirect spam URLs to good pages.
3. Noindex weak content. Threads with no replies, near-empty profiles and posts from brand-new accounts can carry a noindex tag until they earn trust.
4. Qualify outbound links. Add rel="ugc" (or nofollow) to links inside user content by default.
5. Block repeat offenders. Maintain IP, email-domain and keyword blocklists.
6. Remove spam from search faster. For urgent, harmful URLs, use the Removals tool in Search Console as a temporary measure while deletion takes effect.
7. Request review if needed. If there is a manual action, explain the issue, the steps taken and the outcome in your reconsideration request.
8. Monitor. Track new sign-ups, posts held for moderation and indexed spam terms weekly.

Link attributes: ugc, nofollow and sponsored

Links inside user content are the main reason spammers target your site. Google's guidance is direct:

“consider adding a nofollow or ugc rel attribute to all links in untrusted content.”

— Google Search Central, Prevent user-generated spam on your site and platform

Google's link qualification page recommends the ugc value for links in comments and forum posts. You can combine values, for example rel="ugc nofollow". Many communities remove the attribute for trusted long-term members, which rewards good contributors without opening the door to spam. For background on attributes, see dofollow versus nofollow links.

Prevention tools and when to use them

Google's page on preventing user-generated spam lists practical measures: state a no-spam policy and let users report spam, look for patterns in suspicious accounts, require approval for suspicious contributions, keep a blocklist, make automated account creation harder, and monitor for spam signals and traffic spikes. It also admits the trade-off:

“Moderation adds overhead to your daily workflows, however it's a very effective way of fighting spam.”

— Google Search Central, Prevent user-generated spam on your site and platform

Measure	Stops	Cost to genuine users
CAPTCHA or human verification at sign-up	Bulk automated accounts	Low
Email verification	Throwaway accounts	Low
First-post moderation queue	Drive-by link posts	Medium (short delay)
Link limits for new accounts	Link-dropping	Low
Noindex for new-user content	Spam reaching search results	None visible
Anti-spam filtering services and keyword blocklists	Known spam patterns	Low (occasional false positives)
User reporting button	Spam moderators miss	None

Good moderation is also good community management. Members stay longer when threads are clean.

How this fits the spam update timeline

Google describes SpamBrain as its AI-based spam-prevention system, and it says it improves that system over time. Our explainer on SpamBrain covers what is publicly known. Spam updates are different from core updates: they target policy violations, while core updates reassess quality more broadly. See core updates versus spam updates for how to tell which one affected you.

Common mistakes

• Cleaning without closing the door. If sign-ups stay open and unmoderated, the spam returns within weeks.
• Mass-deleting genuine content. Old threads with real answers are an asset. Remove spam, not history.
• Redirecting spam URLs to your homepage. Let them return 404 or 410 instead.
• Noindexing the whole forum. That removes the good with the bad. Use targeted rules.
• Filing a reconsideration request without a manual action. There is nothing to reconsider; focus on cleanup and monitoring.

Related Guides

• Recovering When a Hacked Site Gets Caught in a Spam Update
• Cleaning Up Doorway-Style Location Pages After a Spam Update
• What to Do (and Not Do) While a Core Update Is Rolling Out

Frequently Asked Questions

Can user comments really hurt my rankings?

Yes, if spam is widespread. Google's spam policies list comment spam and spammy forum posts as user-generated spam, and Google has a manual action for spam submitted by site visitors.

Should I use rel="ugc" or rel="nofollow" on user links?

Google recommends ugc for links in comments and forum posts, and nofollow remains acceptable. You can use both together.

How long until rankings recover after cleanup?

There is no fixed timeline. With a manual action, a successful review can lift it. For algorithmic effects, Google says its systems may take months to learn that a site now complies.

Should I close comments entirely?

Only if you cannot moderate them. Many sites keep comments on with moderation queues and noindex rules, which keeps the value without the risk.

Do I need to disavow links my users posted?

No. Disavow is for inbound links pointing to your site. Spam links users posted on your site are outbound links: remove them or qualify them with ugc or nofollow.

Conclusion

User-generated spam is a moderation problem first and an SEO problem second. Stop new spam, clean what is there, qualify links and keep weak content out of the index. If a spam update or manual action has already hit you, our spam update recovery guide sets out the full process, and our penalty recovery service can handle the audit and reconsideration request for you. You can also get a free quote.

References

1. Spam policies for Google web search (Google Search Central)
2. Prevent user-generated spam on your site and platform (Google Search Central)
3. Qualify your outbound links to Google (Google Search Central)
4. Manual Actions report (Search Console Help)
5. Google Search spam updates (Google Search Central)
6. Google Search Status Dashboard: Ranking incident history