For two decades, Cannes Lions has been the advertising industry’s high church of the campaign — the ad, the stunt and the killer creative idea. This year, the conversations actually happening in the villas and the beach cabanas aren’t about creative execution at all. They’re about something closer to brand infrastructure: how brands get discovered, trusted, and recommended by AI systems that don’t care about a media plan. That’s a quieter, less glamorous story than the one Cannes normally embodies, but it’s the one playing out behind the closed doors.
Take one exchange overheard in a meeting earlier in the week, where an exec running media and analytics for a major platform laid out the unglamorous part nobody wants to talk about: coordination. When someone gets a single answer back from an LLM, they said, that answer was assembled from everywhere — SEO, PR, content and product — whether the company meant it to be or not. So the job isn’t optimizing one channel anymore. It’s making sure every function is pointed at the same message because the model doesn’t know or care which team owns which piece.
Strip the AI framing out of that and it’s not really a search problem at all. It’s the oldest brand-building problem there is — does this company say one consistent thing about itself, everywhere, all the time — except now there’s a machine reading every inconsistency back to the customer in real time. Search used to forgive a messy brand. You could buy your way to the top of a results page even if your PR, your reviews and your product page told three different stories. An LLM doesn’t buy that. It synthesizes whatever’s out there, gaps and contradictions included, and hands the customer one version of the truth. So the “SEO problem” everyone at Cannes is panicking about isn’t really about search at all. It’s brand coherence, finally getting graded in public.
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