pinterest Articles

Pinterest built a real-time AI-assisted system to measure the prevalence of policy-violating content by tracking what users actually see, not just what they report.

ai

engineering

foundational-model

trust-and-safety

41 min read

Machine Learning•2025-12-05

Improving Quality of Recommended Content through Pinner Surveys

Pinterest describes how Pinner (user) surveys are used to train a machine learning model that improves content quality recommendations across Homefeed, Related Pins, and Search.

Machine Learning•2025-12-04

On the (re)-prioritization of open-source AI

Pinterest shares its strategic shift toward fine-tuned open-source AI models, achieving comparable performance at less than 10% the cost of proprietary models.