This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Since its launch in 1998, Google, the world's leading search engine, has transformed how people find information online. For years, search results appeared as ranked lists of sources: Google decided what to show, but users decided what to read and whom to trust.
However, the advent of Google AI Overviews has fundamentally changed that paradigm. Today, when a user searches for anything from "How long do I boil eggs?" to "How do I lower my cholesterol?" there's a good chance the response will lead with a single artificial intelligence (AI)-generated summary. This change gives Google unprecedented editorial control over what users read and know, according to Jacob Montgomery, a professor of political science in Arts & Sciences at Washington University in St.
"Google is now writing answers, not just ranking them, and it does this for billions of searches," Montgomery said. "Yet we know very little about how the system works. When does an overview appear?
Which sources does it draw on? Are the summaries accurate? And what happens to the rest of the web when people no longer click through?
Our goal was to answer these basic questions." A forthcoming paper, to be presented at the October 2026 ACM Internet Measurement Conference, offers the broadest independent audit of Google AI Overviews to date—examining AI Overview activation patterns, source selection, whether claims matched their sources and the potential impact on publishers' advertising revenue. The co-authors are Umar Iqbal, an assistant professor of engineering at WashU McKelvey Engineering, and Haofei Xu, a graduate student in the WashU Division of Computational and Data Sciences. The work is also available on the arXiv preprint server.
Altogether, the researchers ran 55,393 Google searches on trending topics over 40 days, from March 13 through April 21, 2026. They collected each AI Overview, its citations, the first-page search results displayed with it and the content of cited webpages. The research showed AI Overviews appeared for 13.7% of all queries, but the rate varied sharply based on how users worded their searches.
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