Design NewsFeed System for Social Media

Functional Requirements:

• Users can create and view posts (text, images, videos).
• Users have a personalized feed showing posts from users they follow or are friends with.
• Users can like and comment on posts.
• Feed should show posts in reverse chronological order (most recent first).
• Users can control the visibility of their posts (public, friends only).
• Users receive real-time updates when new posts are available in their feed.
• Support for infinite scrolling or pagination in the feed.

Non-Functional Requirements:

• The system should be highly available and responsive (feed loads within 2-3 seconds under normal conditions).
• The system must be able to scale to millions of users and posts.
• Data consistency should be eventual for the feed (minor delays in showing new posts are acceptable).
• User data and posts should be securely stored and transmitted.
• The system should be reliable, with minimal downtime.
• Privacy controls must be enforced for post visibility.
• The system should be able to handle peak loads gracefully.