Community Notes reinvents fact-checking

Under Musk, X scaled Community Notes into one of the most influential ideas in modern social media. Instead of relying on a central team of fact-checkers, it lets users propose context on posts — and a "bridging" algorithm shows a note publicly only when people who usually disagree with each other both rate it helpful. That cross-perspective requirement makes it far harder to game than majority-vote systems.

The system grew to well over a million notes across dozens of languages and, notably, applies to everyone — including Musk's own posts, which have been corrected by it. A 2025 study in PNAS found Community Notes reduced the spread of false information.

Its biggest endorsement came from rivals: in 2025 Meta announced it would replace third-party fact-checkers with a Community-Notes-style system across Facebook, Instagram and Threads, and TikTok launched its own version. An idea championed on X became an industry standard for fighting misinformation.