9% of AI Overview answers are in the hands of social networks
9% of visibility on Google AI Overview is concentrated in just 10 sites. And these aren’t just any sites, nor are they hyper-specialized vertical portals: they are social networks. If you still have doubts, this is definitive proof that social media and SEO are no longer separate silos, because Google ranks that content directly in SERPs and even at the heart of its generative responses.
The quantitative data—ten platforms account for nearly a tenth of the visibility generated in AI Overview—is complemented by qualitative analysis: YouTubeis the second most cited domain overall, surpassed only by Wikipedia. To explain and describe the world, artificial intelligence trusts (and relies on) video content more than millions of optimized web pages.
While we discuss the impact of AI and how to optimize content for artificial intelligence, the data from our database reveals a much harsher reality: access to generative answers is not democratic, because here too Google has stopped searching for answers in the “open sea” of the web to take refuge in a few, gigantic safe havens.
AI Overviews on Social Media: SEOZoom’s Analysis
We put the databases of SEOZoom Observatory to the test to analyze the state of the art of AI Overviews in Italy and to understand how visibility is evolving in this area.
Our focus was on the segment of keywords that trigger the Google box—currently 9,217,798, accounting for about 40% of the analyzed SERPs—to identify the origins of the sources used for Source Grounding (the validation of answers), cross-referencing the cited domains with the major social media platforms.
We scanned over 245,000 unique domains appearing within millions of responses, segmenting mentions, estimated organic traffic, and average position in AI Overview to understand who is truly “feeding” the algorithm, then cross-referenced the domains cited in the generative boxes with major social media platforms to measure their specific weight.
What emerges is a clear picture of how Google is using user-generated content to train its responses: social networks are no longer mere destinations for traffic, but knowledge infrastructures necessary for the very functioning of the search engine. In purely numerical terms, the raw data reveals that the top 10 social domains alone accumulate 1,350,609 total mentions and actively cover 844,943 keywords.
The 9% constant for the human signal
To understand the specific weight of this data, you must compare it with the size of the Italian web known to Google. Our organic database monitors over 168 million domains—it is the universe of the web as we know it, vast and fragmented. However, when it comes to feeding its synthetic responses, the algorithm makes a ruthless selection: within the AI Overviews, we identified just 216,023 unique domains used as sources.
Do the math: this means that only 0.12% of the web is deemed authoritative or trustworthy enough to “feed” the AI. And within this exclusive club, social networks account for 9.16% of total visibility; they are definitively the new institutions, sources of validation that the algorithm uses to construct its answers.
We took our analysis a step further, because a curious finding emerges when we cross-reference this number with our previous analyses on Social Search. In classic organic search, we found that social profiles occupy about 9% of the positions on the first page, and in AI Overview, the share is practically identical. This overlap suggests structural stability: the algorithm appears programmed to balance corporate web content with a constant dose (about one-tenth) of user-generated content. The difference is that while that 9% used to be a “blue link” driving traffic off-site, today it is a source ingested by the AI to construct the response directly on the page. The container changes, but the need for social validation remains the same.
The Social Media Hierarchy in AI Overview
By analyzing the distribution within the social media cluster, we find that visibility follows a specific direction and is heavily concentrated on just two giants by volume, with a third player standing out in terms of positioning.
YouTube alone covers 610,077 keywords in AI Overview, equal to 6.62% of the entire Italian AIO universe. If we consider the social share alone, YouTube accounts for 71.8% of the total. Adding Facebook (www and mobile domains) brings the total to 731,176 keywords, or 86.1% of the entire social media share. All other platforms—Reddit, Instagram, TikTok, LinkedIn, Pinterest, Quora, X—must share the crumbs of the remaining 13.9%.
Here are the actual figures for the players in the field:
- YouTube monopolizes 6.62%
With 610,077 keywords covered, YouTube alone accounts for 6.62% of the total AI Overview share in Italy. The numbers are impressive: 1,039,444 total mentions and an estimated potential traffic of 19.7 million. But the most significant technical metric is the Average Position: 4.17. This means that YouTube is not only everywhere but consistently occupies the top of the generative search results. AI uses it to fill the “demonstrative gap”: when a search requires explanation, clarification, or further detail, video offers a density of information that text cannot match. The structure of video content, often tutorial or explanatory, aligns with the format of the concise response, and thanks in part to automatic transcripts, Gemini “reads” the video and uses it as a primary source. If you don’t produce videos, you’re virtually invisible to the AI—not because your content is poor, but because the format isn’t what’s required to validate the response.
- Facebook and the Critical Mass
In second place is Facebook with 121,099 keywords and 135,516 mentions in total. This is proof that the AI looks for signs of “vitality” in local entities and group discussions. However, there is a red flag regarding quality: its Average Score is 5.44, the lowest among the major players. The AI uses it as a database to verify the existence and activity of local entities (businesses, events, associations) and to track group discussions (social consensus), but it is given lower priority than video or vertical content. While a website may be static, an active Facebook page with reviews and recent posts is a signal of freshness (QDF – Query Deserves Freshness) that the AI uses to confirm that a business is still operational. It is the “sign of life” that Google looks for to avoid providing outdated answers, but it rarely becomes the “definitive answer.”
- Reddit: lower volume, maximum trust
The real outlier is Reddit. With 43,431 keywords and 70,470 mentions, it has significantly lower volumes than the two giants (accounting for about 5% of the social share). However, it wins on the most important metric, because the Average Position is 3.86. It’s the best score across the entire panel, even higher than YouTube. This tells us something fundamental about the algorithm: when the AI decides to cite Reddit, it does so by placing it at the top, treating it as a source of “priority experiential truth” (E-E-A-T). Reddit is small in volume but massive in recognized authority—a “raw” forum thread is evaluated by the algorithm as a signal of human authenticity that is impossible to simulate.
Rounding out the Top 5 are Instagram (35,689 mentions) and TikTok (19,579). Their presence is significant, but the numbers are light-years away from the leaders. This “limitation” does not stem from the platforms’ popularity (which is immense), but from their technical architecture. As “walled gardens” based on rapid visual feeds often lacking dense textual metadata (such as YouTube’s perfect automatic transcripts or Reddit threads), LLMs struggle to use them as grounding sources for complex responses. AI cites them, but prefers more “readable” sources when it needs to construct a detailed response: they arepowerful social platforms for human discovery, but they are nearly irrelevant for the training of generative responses.
How the concept of authority is changing
The data’s verdict is clear: Google’s AI isn’t looking for “new content”; it’s looking for validation and grounding. The algorithm has built a very rigid trust hierarchy: it relies on Wikipedia for encyclopedic knowledge, on high-trust vertical portals for health, and on social media giants for direct human experience. The “generalist” web—that of sites covering a little bit of everything without a real Topic Authority—is cut off from the conversation.
When AI references a YouTube video or a Reddit thread, it is performing an authority transfer. It uses that content to lend credibility to the generated response. This transforms community management and video production into pure technical SEO activities. It’s no longer about “doing social media” to drive traffic to your site, or treating these platforms as external channels to “push” your content onto, but about dominating the platforms that AI uses to learn. If accurate information about your brand isn’t found on YouTube or Reddit, the AI might get confused or, worse, cite a competitor that’s present where the algorithm is looking.
Operational Strategy to Join the 0.12% Club
If you want to enter the secure realm of AI Overview, you have two paths: either build a brand with such monolithic authority that it falls within the 216,000 selected domains, or you must place your content within the platforms that Google has already decided to reward.
- YouTube for informational content: you must provide the AI with the “visual layer” of your expertise. Videos must have titles that answer specific queries and transcripts containing the semantic keywords of your industry. You’re speaking to the machine, before the user.
- Reddit and forums for trust: you can’t control the conversation, but you must monitor it. AI reads sentiment. If your brand is associated with negative terms on Reddit, this bias will influence the generated response.
- Signal consistency: the goal is to create resonance. If the AI finds the same technical information on your site (including via schema markup), in your YouTube video (transcript), and in a social media discussion (consensus), your Topic Authority becomes unassailable.
