Do blog comments really count as main content in Google's eyes?

Why is the distinction between main and peripheral content crucial?

Google has always differentiated between main content and ancillary content (sidebar, footer, navigation). This distinction is not trivial: it directly determines how the algorithm evaluates the quality of a page and its ranking potential.

Traditionally, SEOs placed comments in a gray area—neither truly main content nor completely ignored. Mueller's statement makes it clear: comments are fully integrated into the main content and therefore participate in the qualitative evaluation of the page just like your article.

What does this mean for page evaluation?

If your comments are seen as main content, they factor into the assessment of thematic relevance, the depth of topic treatment, and potentially E-E-A-T signals. A 300-word article with 15 developed and relevant comments can theoretically outperform a competitor who publishes 800 words without discussion.

This logic particularly applies to short posts that serve as discussion triggers. Mueller explicitly states: if the initial post is short but the comments substantially enrich topic treatment, the page gains value.

In what cases do comments truly enrich a page?

Not all comments are created equal. Mueller clearly specifies: “quality comments”. This nuance is critical as it implies an editorial filter—you cannot rely on an uncontrolled stream of “Thanks for this article!” or disguised spam.

Enriching comments are those that provide complementary perspectives, concrete use cases, documented counterarguments, or technical clarifications. In other words, those that transform a monologue into an expert conversation.

• Comments are evaluated as main content, not as negligible peripheral content
• A short article can be enhanced by substantial and relevant comments
• The quality of comments matters as much as their presence—spam or empty contributions add nothing
• This logic favors “discussion” formats where the initial article serves as a trigger rather than a definitive answer
• Your moderation strategy becomes a direct SEO lever, not just a community management issue

Is this statement consistent with field observations?

Yes and no. On niche sites with a strong engaged community (technical forums, specialized blogs), it is indeed observed that pages with rich discussions perform better than similar pages without interaction. However, attributing this performance solely to comments is more correlation than causation.

What complicates things: Google has also previously stated that user engagement signals (time spent, bounce rate) are not direct ranking factors. Yet, pages with comments naturally generate more engagement. It’s difficult to untangle what is due to the content itself versus induced behavioral signals. [To be verified]

What nuances should be added to this claim?

Mueller speaks of “quality comments” without precisely defining that threshold. In practice, most comments on the web are poor: generic thanks, disguised spam, off-topic questions. If Google treated all of them as high-quality main content, there would be an explosion of manipulation.

My interpretation: Google likely applies a qualitative assessment of comments before fully integrating them into page scoring. Length, semantic relevance to the topic, lexical diversity, argumentative depth—all are possible signals to filter out the noise. But there is no official confirmation on this.

In what cases does this logic not work?

On e-commerce sites, product reviews are technically “comments” but are probably not treated the same way as a blog comment. Google has specific algorithms for reviews. Don’t mechanically transpose this statement to all types of user-generated content.

Similarly, on sites with a high volume of spam or self-promotional comments, leaving comments open without strict moderation could degrade the perceived quality of the page. There is a risk that Google detects an unfavorable signal-to-noise ratio and penalizes the page rather than rewarding it.

What should you do practically to leverage this logic?

First, reevaluate your moderation policy. If you approve all comments by default, you’re likely letting noise slip through that dilutes your pages' value. Implement clear criteria: minimum length, thematic relevance, absence of disguised spam.

Next, encourage quality comments rather than volume. End your articles with an open question that invites argument, not a generic “What do you think?” Responding to substantial comments encourages discussion—a reply from the author increases the depth of topic treatment.

What mistakes should you absolutely avoid?

Don’t engage in artificial comment generation, even if it’s “quality.” Google detects manipulation patterns, and the reputational risk is huge. Also, avoid turning your comments section into a spam ground: it's better to have a few excellent comments than 50 empty contributions.

Don’t neglect the technical aspect: ensure your comments are crawlable, indexable, and properly marked up in semantic HTML. Some CMS load comments through deferred JavaScript—check that Googlebot can actually access them through a test in Search Console.

How can you verify that this strategy works on your site?

Compare the performance of your pages with rich comments vs. similar pages without discussion. Look at click-through rates, average positions, and time spent on page. If you see a significant gap, it's a signal that Google is indeed valuing these pages.

Also, test the impact of curation: remove spam comments from a test page and measure performance changes over 4-6 weeks. If you observe an improvement, you confirm that the quality of comments matters more than their quantity.

• Implement strict moderation with explicit quality criteria (length, relevance, added value)
• Systematically respond to substantial comments to enrich discussion
• Ensure your comments are technically crawlable and indexable
• End your articles with open questions that invite detailed argumentation
• Monitor the signal-to-noise ratio and eliminate empty or off-topic contributions
• Compare the SEO performance of your pages with vs. without rich comments