Design a Social Media Platform like Facebook or Twitter

Functional Requirements:

• Users can create an account and log in.
• Users can post short text updates (e.g., up to 280 characters).
• Users can follow and unfollow other users.
• Users can view a personalized feed of posts from users they follow.
• Users can like posts.
• Users can view profiles of other users, including their posts and follower/following counts.

Non-Functional Requirements:

• The system should be able to serve up to 100 million daily active users.
• The home feed should load the first 10 posts within 500ms for the user.
• The system should be highly available, targeting 99.9% uptime.
• Eventual consistency is acceptable for feeds and likes.
• The system should be horizontally scalable to handle growth in users and data volume.