Design Twitter

• 1. Clarify the requirements
• 2. Capacity estimation
• 3. Posting a tweet
• 4. Uploading media
• 5. Following and unfollowing
• 6. Fanout — how a tweet reaches followers
• 7. Reading the home timeline
• 8. Flagging celebrities
• 9. Posting as a celebrity
• 10. Reading the home timeline with celebrities