Agencies & Marketing — New ad frontiers open across AI, CTV, synthetic audiences, and creator-led testing as platforms and publishers race to own post-cookie media planning.

Agencies & Marketing · 2026-04-27

TODAY'S SIGNAL — Four developments from a single news day converge on one theme: the advertising infrastructure is being rebuilt in real time, and agencies that don't engage now risk losing strategic ground. Meta is pushing into CTV to extend its performance-advertising machine beyond mobile feeds. OpenAI has opened an ad pilot that marketers are joining despite unclear ROI — a signal that…