16 Design a news feed
This chapter covers
- Designing a personalized scalable system
- Filtering out news feed items
- Designing a news feed to serve images and text
Design a news feed that provides a user with a list of news items, sorted by approximate reverse chronological order that belong to the topics selected by the user. A news item can be categorized into 1–3 topics. A user may select up to three topics of interest at any time.
This is a common system design interview question. In this chapter, we use the terms “news item” and “post” interchangeably. In social media apps like Facebook or Twitter, a user’s news feed is usually populated by posts from friends/connections. However, in this news feed, users get posts written by other people ...
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