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OOD - Facebook

hardLast edited: January 1, 2026

Problem Statement
Requirements Analysis
Functional Requirements
Non-Functional Requirements
Use Case Diagram
Class Diagram
Activity Diagrams
1. Friend Request and Connection Flow
2. News Feed Generation and Ranking
3. Real-Time Messaging with Delivery Confirmation
Implementation
Key Design Decisions
1. State Pattern for Account Management
2. Strategy Pattern for Feed Ranking
3. Observer Pattern for Notifications
4. Factory Pattern for Content Creation
5. Composite Pattern for Comment Threads
6. Facade Pattern for Search
7. Bidirectional vs. Asymmetric Relationships
8. Privacy Settings Architecture
9. Graph Traversal for Friend Suggestions
10. Message Delivery with Read Receipts

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