This question is a classic Fermi problem, designed to assess your problem-solving and estimation skills rather than your knowledge of specific Facebook user statistics. The goal is to demonstrate a logical approach to breaking down a complex question into manageable parts and making reasonable assumptions. A strong answer would involve:
- Clarifying Questions: Ask about the scope (e.g., global users, specific regions, active users vs. total registered users).
- Assumptions & Data Points: Estimate total registered users, the percentage of users active daily, and the average time spent online.
- Calculation: Develop a formula, for example: (Total Registered Users) * (Daily Active User Percentage) * (Average Session Length / Total Hours in a Day).
- Reasoning: Clearly explain each assumption and calculation step, acknowledging potential inaccuracies and edge cases (like bots or users with multiple sessions).
Amazon