When you open your favorite social media app like Instagram, Facebook, LinkedIn or Twitter, you’re instantly shown a personalized stream of posts. These can include text updates, photos and videos from the people and pages you follow or from posts your friends have engaged with. This seamless and engaging experience is made possible by the news feed system, one of the core features of any modern social platform. But building a system that delivers this experience to 100 million+ daily active users (DAUs) is anything but simple. It brings up several complex challenges like: In this article, we’ll start with…

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