Design the 'For You' page on TikTok.

To design TikTok's 'For You' page, I'd focus on a personalized, dynamic content feed. The core functionality revolves around a recommendation engine that analyzes user behavior (likes, shares, comments, watch time), explicit interests (selected during onboarding), and social connections (accounts followed). This engine would continuously learn and adapt to surface relevant videos. Key features would include:

1. Personalized Feed: A scrollable, infinite feed of short-form videos tailored to individual user preferences.
2. Content Discovery: Algorithms that balance familiar content with new, trending, or niche content to broaden user horizons.
3. User Interaction: Seamless integration of like, comment, share, and follow actions to provide feedback to the recommendation system.
4. Onboarding & Preferences: Initial interest selection and ongoing implicit learning to refine recommendations.
5. Content Diversity: Ensuring a mix of video types, creators, and topics to maintain engagement.
6. Performance: Optimized video loading and smooth scrolling for a high-quality user experience.