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Arne van Elk

LLM Training Data Is Not What You Think

To do an AI search training data availability audit, use the five checks proposed in the Common Crawl field guide:
1. CCBot access
2. Common Crawl Index coverage
3. Harmonic Centrality
4. structured data completeness
5. server-side rendering

Then look at robots.txt, CDN, WAF rules and bot-management settings. Server log analysis is your best starting point here (check what we do at Oncrawl ).

Check whether the domain is actually present in the Common Crawl Index. I also recommend Metehan Yeşilyurt 's Harmonic Centrality rank checker: https://webgraph.metehan.ai/

Check whether important content is visible in the raw HTML and not only injected after JavaScript execution.

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Arne van Elk

Google Search’s I/O 2026 updates: AI agents and more

"The new intelligent Search box is starting to roll out today, in all countries and languages where AI Mode is available."

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Arne van Elk

(1) How to build an AI SEO strategy that outlasts tactics

A tactic list isn't a strategy. Here's the difference and how to fix it.

Most AEO "strategies" are tactic lists dressed up as long-term direction. They often break the first time a platform changes or leadership asks questions. A real AI SEO strategy starts with the business problem, builds on your brand's unique advantages, and lets tactics come last.

This week, we're covering:

* How to identify your actual AI SEO challenge (it's a business problem, not a channel problem)
* A 3-part strategy document structure that survives leadership scrutiny and platform shifts
* How to present AI SEO investment using scenario planning instead of traffic forecasts

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Arne van Elk

AI Citation Ranking Factors Analysis

TL;DR - While the evidence suggests that specific practices can boost AI citations, most of the critical factors align with traditional SEO practices. This is important because there’s much debate in the AI / SEO world about whether optimizing for AI visibility requires a different toolset.

In this case: win SEO, win AI citations (most of the time, with extra steps.)

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Arne van Elk

AI Visibility is a Vanity Metric, here's how to tell your boss

AI visibility on its own is a vanity metric. Just like rankings were, but it is harder to determine how AI visibility is impacting your bottom line.

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