Google AI Overview Citation Share - May 2026

The top 16 websites Google AI Overview cited most in May 2026, ranked by share of all citations, with notes for SEO teams working on generative engine optimization (GEO).

Klaas Foppen·June 5, 2026

The Most Cited Domains on Google AI Overviews in May 2026

Based on prompts and citations tracked from Apr 30 - May 30, 2026. Citations are tracked from search responses using Google AI Overviews (inline/side panel).

What this means for you

In May, Google-owned properties bookend the podium: YouTube leads at 3.74% and google.com itself takes third at 1.15%, with Reddit between them at 2.52%. Add Facebook (0.94%) and Instagram (0.52%), and the top of the chart is entirely video, community and social. Classic reference domains like Wikipedia (0.10%) barely register in comparison.

That mix says a lot about how AI Overviews choose sources: they inherit classic Google Search's trust in big engagement platforms rather than ChatGPT's heavy Reddit skew. For marketers, visibility increasingly means being present where people watch and discuss, not only where they read.

How to act on it

• Claim your share of the Google-owned surfaces that now sit first and third: optimize your YouTube presence for your core queries and make sure your Google Business Profile, Merchant listings and other google.com touchpoints are complete and accurate.
• Match content format to the citation pattern: video and community answers are what AI Overviews reach for. A written guide plus a companion video plus an honest presence in the relevant Reddit threads covers the three biggest citation sources in one workflow.
• Keep publishing rank-worthy pages on your own domain: with the 16 giants tracked here totaling around 11% of citations, the remaining ~89% flows to the broader web, where specific, well-structured answers win.

Google AI Overview Citation Share April vs May 2026

Side-by-side comparison of citation share for the top domains on Google AI Overview between April and May 2026.

What this means for you

The April-to-May story is google.com nearly doubling its own citation share, from 0.61% to 1.15%. That recovers its April dip and then some. Reddit continued its uninterrupted 2026 climb (2.25% to 2.52%), and Facebook jumped from 0.78% to 0.94%. The flip side: LinkedIn fell about 20% from its April peak (0.92% to 0.74%) and Medium lost nearly a third of its share (0.45% to 0.32%). Citation share is zero-sum, and the gains for Google's own properties and community platforms came directly out of professional publishing platforms this month.

How to act on it

• If Medium hosts any of your cornerstone content, migrate or mirror it to your own domain. Its 29% share drop shows rented platforms can lose AI visibility overnight and take your content's citations with them.
• B2B marketers should watch LinkedIn closely next month: one down month after a steady climb isn't a trend, but a second consecutive drop would be a reason to rebalance toward YouTube and Reddit, which keep gaining.
• Factor google.com's near-doubling into your keyword strategy: for queries where Google now cites its own help pages, Maps or Shopping surfaces, your best play is to be present inside those surfaces rather than compete against them.

How we collect this data

We collect millions of prompt responses, citations, and click data from the actual user interfaces of major AI platforms: over 26 billion data points and growing. This gives us one of the largest datasets on how AI search engines cite sources and recommend brands.

Real UI monitoring

Data straight from the interfaces of ChatGPT, Gemini, Perplexity, Claude, AI Overviews, and more.

26B+ data points

Over 26 billion analyzed citations, prompts, and responses, one of the largest AI search datasets available.

Continuously updated

Refreshed constantly so the trends you see reflect the latest behavior of AI search engines.

Aggregated & public

Published freely for the GEO community, based on aggregated, non-identifiable trends.