Design a REST API for Social Media

Design a RESTful API for a social media platform with posts, comments, likes, follows, and real-time notifications.

Functional Requirements

• User profiles and authentication
• Posts with media attachments
• Comments and nested replies
• Likes and reactions
• Follow/unfollow relationships
• News feed generation
• Notifications

Non-Functional Requirements

• Handle viral content with millions of interactions
• Real-time updates for notifications
• Efficient feed generation
• Media upload handling
• Rate limiting per user

Questions to Consider

• How do you model the social graph efficiently?
• What's the best approach for feed pagination?
• How do you handle real-time updates in a REST context?