Engineering for nostalgia: Building a personalized “On This Day” experience

This post details the engineering efforts behind the 'On This Day' feature, a personalized memory surfacing experience. It highlights the integration of user experience research, automatic filtering (e.g., for exes, blocked people, dismissed memories), user-controlled preferences (blocklisting people or dates), and a machine-learning ranking model. The ranking model utilizes personalization signals (user interactions, demographics) and content understanding powered by a computer vision platform to identify and surface meaningful memories in the News Feed.