Personalized news feed on GCP with ranking, fan-out strategies via Pub/Sub, and Memorystore caching for social platforms.
Difficulty: intermediate
Tags: feed, ranking, fan-out, personalization, gcp
A news feed system generates personalized content streams for each user by aggregating posts from their connections and ranking them by relevance. The core challenge is the fan-out problem: when a user with millions of followers posts, how do you update millions of feeds efficiently? Recommended for engineers building social platforms where personalized content delivery and fan-out scalability are critical to user engagement.