TL;DR
- Google is testing a 'Dive deeper' button in Discover that opens a short Google-written topic overview with links to related stories underneath, reported by PPC Land on 20 September 2026.
- Robby Stein disclosed it on X on 18 September, starting on video cards; there is no blog post, help page, market list, or opt-out, and no traffic figures.
- Publishers object that it adds a second tap target opening a Google screen, where the overview already gives the key facts and outbound links are small with truncated headlines.
- It matters because Discover is now two-thirds of Google referrals to 2,000 news sites, and a researcher's code flags suggest article cards are built even though video is first.
- It is an early test with the button doing nothing yet, so the right posture is preparation: reduce dependence on the click and become the source the summary must cite.
Google is testing a "Dive deeper" button in its Discover feed that opens a short, Google-written topic overview with links to related stories underneath, and publishers are already warning it adds one more tap that keeps readers on Google instead of sending them to the source. PPC Land reported the test on 20 September 2026, after Google's Robby Stein disclosed it on X. It starts on video cards, and the concern matters because Discover has become the largest single source of Google referral traffic for many news and content sites.
The disclosure was thin. Stein, vice president of product for Google Search, wrote that Google is experimenting with a way to make exploring a topic easier in Discover: tapping "Dive deeper" shows a short topic overview with prominent links to related stories, community reactions and original reporting, tested on videos to start, with multiple designs to follow. There is no blog post, no help page, and no word on countries, user share, which model writes the overview, how sources are chosen, or whether publishers can opt out.
What the button does, as far as anyone can tell
From the mockup Stein shared and code found by an independent researcher, the shape is clear even though the product is not live. A Discover card carries a video and a short summary, with a "Dive deeper" pill button beneath it. Tapping it opens a second screen: a longer Google-generated overview of the topic, followed by a horizontal row of source cards, each showing a publisher name, a small thumbnail and a headline truncated after a few words. A third screen, "Explore more stories", breaks the topic into follow-up angles, each described in Google's words and attributed to a named outlet.
| Element | What is shown |
|---|---|
| The card | Video plus a short Google-written summary, with a "Dive deeper" button. |
| The overview | A longer Google-generated topic summary, at least two paragraphs. |
| The links | A row of source cards with truncated headlines and small thumbnails, beneath the overview. |
| Explore more | Follow-up angles, each described in Google's words and credited to an outlet. |
Damien Andell of the Discover analytics service 1492.vision activated the button and found it does nothing yet, and surfaced four configuration flags covering two surfaces, video and article, and two placements, an inline button and one that appears after a card is expanded. So although Stein framed it as video-first, the code suggests article cards are already built. The "aio" in the flags refers to the AI summary layer already on many Discover cards, not to AI Overviews in Search.
Why publishers are alarmed
Nicola Agius, SEO and Discover director at the UK publisher Reach, which runs the Mirror, the Express and more than a hundred regional titles, called it Google's latest attack on publisher traffic. Her objection is precise and worth understanding, because it applies to any brand that depends on content reaching readers.
On a normal Discover card the image is the main tap target, and it opens the publisher's page. The new button adds a second target on the same card that opens a Google screen instead. Once there, the reader gets a Google-written overview that already contains the key facts, and the links out are small, with truncated headlines and tiny thumbnails, which Agius said is hardly a setup for driving clicks. Her question is the one every content owner should ask: if Google already gives the reader the key details in the summary, what is the incentive to click through to the source at all.
She noted one better element, the "Explore more stories" layout, because it gives readers a reason to click into specific angles. But even there the publisher controls nothing: the links carry no featured images, and Google writes the description of what each story contains. On a normal card a publisher controls its own headline and image. On the overview screen it controls neither, and Google chooses the angle.
The scale that makes this matter
The reaction is proportionate to how much traffic Discover now carries. Research covered by PPC Land found Discover accounted for two-thirds of Google referrals to 2,000 global news and media sites, overtaking traditional search, while Google Web Search's share of publisher traffic fell from 51% to 27% between 2023 and 2025. Discover itself is not immune: page views from it fell 15% between December 2024 and December 2025. Reach, Agius's employer, reported Google referral volumes down 55% year on year in the first half of 2026.
Dive deeper also stacks on top of AI layers already in the feed. Google rolled out AI-generated previews in Discover in late 2025, and by December one analysis found 51% of the Discover feed in some markets consisted of AI summaries. The button adds a second generated layer: a summary on the card, then a longer overview one tap later, and publisher links only at the bottom of that second screen. It mirrors a move Google made in Search, where a button on an expanded AI Overview leads deeper into Google rather than out to a site, and where one study found AI Overviews correlated with a 58% reduction in click-through for top-ranking pages.
What it is not, and what is unconfirmed
It is worth being disciplined about what is actually known. This is a test, disclosed in a single social post, and the button did nothing when a researcher forced it on, which suggests the client code has shipped ahead of the live experience. Google has not named the markets, the share of users, the model, the source-selection logic, or an opt-out. The mockup is an illustration, and some outlet names in it are not real publications. Nobody outside Google has measured its effect on clicks, because it is not yet running for real users.
So the correct posture is preparation, not panic. The direction is unmistakable, and it matches everything Google has shipped in Search and Discover over the past year, but the specifics that would let a publisher quantify the hit do not exist yet.
What this means for Thai marketers
Discover is a major traffic source for Thai publishers and content-led brands, often larger than Search, so a feature that keeps readers inside a Google summary lands here as squarely as anywhere. A Thai news site or a brand that leans on Discover for reach should treat this as confirmation that Discover referral traffic is a channel Google can compress at will, the same lesson the AI summaries in the feed already taught.
The response is the one that holds across every zero-click shift. Build the brand and the owned channels so that being named in a Google-written overview still produces value, through recognition that drives a later branded search or a direct visit, rather than depending on the click that Discover may not send. Make the content the thing Google's overview is built from and forced to cite, which is the aim of generative engine optimisation. And keep the audience relationships you own, email, LINE, a loyal direct audience, as the layer that does not depend on Google's next design choice. The technical foundations for being citable sit in the same SEO and content marketing work you already run; this test just raises the stakes on doing it well.
Frequently asked questions
What is Google's "Dive deeper" button in Discover?
It is a test button on Discover cards that opens a short Google-written topic overview with links to related stories, community reactions and original reporting underneath. Robby Stein disclosed it on X on 18 September 2026, and it is starting on video cards.
Why are publishers worried about it?
It adds a second tap target on the card that opens a Google screen instead of the publisher's page, where a Google-written overview already gives the key facts and the outbound links are small with truncated headlines. Publishers ask what incentive a reader has to click through when the summary already answers the question.
Is it live now?
No. It is an early test disclosed in a single post, and a researcher who forced the button on found it did nothing yet. Google has not named the markets, the share of users, the model, or whether publishers can opt out, and no effect on clicks has been measured.
Does it affect article pages or only videos?
Stein said the test starts on videos, but configuration flags found by a researcher cover both video and article cards, with inline and post-expansion placements. That suggests the article path is built even if video is switched on first.
What should a Thai content brand do about it?
Treat Discover traffic as a channel Google can compress, and reduce dependence on the click. Build brand recognition that drives later branded or direct visits, make your content the source a Google overview must cite through generative engine optimisation, and grow owned channels like email and LINE that do not depend on Google's design choices.
The bottom line
Google's "Dive deeper" test puts a Google-written topic overview one tap inside Discover, with publisher links pushed small and to the bottom, on the feed that has become the biggest source of Google referral traffic for many sites. It is early, unmeasured and light on detail, so nobody should overreact to the mechanics. But the direction is clear, and for Thai publishers and content brands the lesson is the durable one: reduce dependence on the click, become the source the summary is built from, and own the audience relationships that survive whatever Google ships next.
