For most of the last two decades, a backlink meant one thing: a vote of confidence from one site to another, and the more of those votes a domain collected, the higher it tended to rank. That premise hasn't disappeared, but a second, separate signal has grown large enough to outweigh it in a specific, measurable way - whether AI systems trust a brand enough to name it in an answer, whether or not that answer includes a link at all.
An Ahrefs analysis of 75,000 brands measured how eleven different signals correlate with AI Overview visibility using Spearman's correlation coefficient. Branded web mentions came out on top at 0.664 - more than three times stronger than backlinks, which landed at 0.218. Ahrefs later re-ran the same analysis for ChatGPT and Google's AI Mode and found the pattern held, and in places intensified: YouTube mentions specifically correlated even more strongly, at roughly 0.737.
Where the citations are actually concentrating
Digital PR's structural advantage is that a single placement can produce both a link and a mention - and mentions are increasingly where AI systems assign trust. A separate synthesis of 680 million citations across ChatGPT, Google AI Overviews, Perplexity, Gemini and Claude by 5WPR found citation share concentrating hard at the top: the 15 most-cited domains account for roughly 68% of everything these systems cite, with Reddit alone responsible for close to 40% of citations across the platforms measured.
It moves faster than most PR planning cycles assume
That concentration doesn't mean the list holds still. The same 5WPR research found citation patterns shifting on a timescale of weeks, not years - one platform-side change moved ChatGPT's share of Reddit citations by 50 percentage points inside six weeks. A digital PR program built around today's exact citation landscape is planning around numbers that may not hold by the time the campaign actually lands.
What this means in practice
None of this changes what earns coverage in the first place: a genuinely useful piece of data, a specific and defensible claim, or expertise a journalist can quote with confidence. What's changed is the payoff. A placement that used to be valued mainly for its backlink is now doing double duty - the link still helps traditional search, and the brand mention it carries is exactly the signal Ahrefs' data shows AI systems weighting three times more heavily.
Part of what makes a mention easy for an AI system to trust is whether the system can confidently identify what the brand actually does in the first place, which is as much a technical SEO question as a PR one. Clean structured data and a consistent, unambiguous public identity remove friction that no volume of press coverage fully substitutes for. This is the same logic behind our own digital PR work, and it overlaps more with GEO than either discipline used to acknowledge on its own.
None of this requires Fortune-500 resources. It requires a genuinely interesting claim, made confidently enough that a journalist is willing to attach their name to repeating it, and treating the resulting coverage as infrastructure rather than a one-off campaign, given how quickly the underlying citation landscape keeps moving under it.