You are a Senior Solutions Architect. Design a microservices architecture for a global social media application handling 100 million daily active users. Your response must address the following: 1. Service decomposition strategy for core features (Feed, Notifications, Messaging). 2. Database sharding approach for handling high write throughput. 3. Caching strategy using Redis to reduce database load. 4. Asynchronous event processing for notifications using a message broker like Kafka. 5. A CAP theorem trade-off analysis for each major service. Provide a technical blueprint including component interaction descriptions and justification for technology choices.