UGC-heavy SERPs

The UGC_HEAVY weakness signal fires when 3 or more user-generated-content sites appear in the top 10. It's the most interpretive of the 17 signals — UGC domination is sometimes a golden opportunity and sometimes a dead end, depending on what's driving it.

Which domains count as UGC

SERPTool counts these as UGC-heavy when they appear in the top 10:

Reddit, Quora, Medium, Wikipedia, Pinterest, YouTube, TikTok, Instagram, Facebook, Twitter/X, LinkedIn, Stack Overflow, Stack Exchange, Yelp, TripAdvisor, Product Hunt.

Why it's a weakness signal

UGC sites rank on domain authority rather than specific-page authority. Reddit has DS ≈ 95. Any individual Reddit thread inherits a huge chunk of that authority just by existing. So a 200-word Reddit thread from 2019 can out-rank a thoughtful 2,000-word article on a DS-20 site.

That's a weakness because:

The actual content quality is often mediocre. User-generated means unverified, unstructured, often outdated.
The Reddit thread doesn't have a commercial incentive to be definitive. Yours does.
Google's own quality raters increasingly flag UGC-heavy SERPs as a bad user experience on queries that deserve authoritative answers.

Two patterns, two responses

Pattern 1: Google gave up. Nobody has written the definitive article, so Google falls back to UGC. You see UGC_HEAVY + multiple THIN_CONTENT or OLD_CONTENT flags on the non-UGC results.

Response: this is opportunity. Write the article that should have been written. Aim for comprehensive, current, authoritative. 6–12 months after publishing, you displace most of the UGC threads.

Pattern 2: The query is inherently community-driven. For some queries users actively want UGC — best [thing] reddit, or emotional/experiential queries where user voices are the right answer. Google is giving users what they want.

Response: UGC will stay dominant. You can sometimes slip into a non-UGC slot as "the expert voice" among the community threads, but you won't take #1. Consider whether the traffic is worth the effort — typically yes if volume is high, no if it's a niche query.

How to tell which pattern you're in

Look at the full SERP composition:

UGC + content weaknesses + DS variance (some low-DS) = Pattern 1. Opportunity.
UGC + strong non-UGC results + high average DS = Pattern 2. Community-driven query.

Also check intent:

Informational UGC (how-to, what-is) — usually Pattern 1 if Reddit threads look shallow.
Commercial UGC (best X, X recommendations) — often Pattern 2, because users trust peer reviews here. You can still win a slot with a comparison article that feels objective.
Transactional UGC (rare) — usually Pattern 1. If Yelp pages are ranking for "buy X" queries, the commercial content is missing.

Tactical notes

Match the format. If the SERP is Reddit threads, your page should be visibly community-adjacent: screenshots of actual users, quotes, direct Q&A format. Don't write a corporate brochure into a Reddit-dominated SERP.
Link to Reddit threads from your article. Citation, not competition. You become the hub that synthesises what the community is saying — a role Google likes.
Monitor for rotation. UGC SERPs are less stable than authority SERPs. What's there today may not be there in 3 months. Re-run analyses quarterly on UGC-heavy keywords to catch shifts.

Classic high-opportunity signals

Seeing all of the following at once is as close to a green light as SERPTool gives you:

UGC_HEAVY fires (3+ UGC results)
Average DS across non-UGC results is under 30
Multiple content weaknesses (THIN_CONTENT, OLD_CONTENT) on the non-UGC results
Intent is informational or commercial
Volume is > 500 monthly searches

That's a keyword to write for this month.