Industry analysis of LinkedIn post performance shows median reach has dropped roughly 47% since the platform's new ranking model rolled out. That isn't a slow decline. It's a single architectural change that broke most professional profiles in under a year.
The change is 360Brew, an AI foundation model that replaced LinkedIn's old engagement-velocity ranking system. The research paper was published on arXiv in January 2025. The rollout happened gradually across late 2025 and into early 2026, with LinkedIn's engineering team formally announcing the deployment in March 2026. By Q1 2026, 360Brew was running most of the ranking decisions on the platform.
The old system rewarded posts that collected likes and comments fast in the first hour. 360Brew rewards posts that read as relevant when an AI evaluates the content, the profile, and the posting history together.
From the hiring side, this matters more than most senior professionals realise. According to LinkedIn's own Talent Insights data, 77% of recruiters u