Estimation question
Estimate how many people use Meta products for e-commerce daily.
- Meta
- Estimation
- Medium
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What this question tests
Whether the candidate can build a layered estimate using total user base, e-commerce intent, and daily active behavior.
How to approach it
- State scope: assume Meta's family of apps globally, and confirm daily active users, roughly 3.2 billion, as a stated assumption.
- Estimate the share of daily users who engage with shopping features (Marketplace, Instagram Shop, ads clicked with commerce intent), assuming roughly 15 to 20 percent.
- Multiply: 3.2 billion times 17 percent gives roughly 540 million daily e-commerce touchpoints.
- Adjust for double counting across apps (a user active on both Facebook and Instagram) by discounting the estimate by 10 to 15 percent.
- Land on a final range, for example 450 to 500 million, and state it as an estimate, not a precise figure.
What a strong answer includes
- States every multiplier explicitly and explains why that percentage is reasonable given known e-commerce engagement patterns.
- Adjusts for overlap between apps instead of treating each app's users as fully separate.
- Presents a final range rather than a single falsely precise number.
Common mistakes
- Forgetting to adjust for users who are active across multiple Meta apps.
- Not defining what counts as 'using for e-commerce' before estimating.
Likely follow-up questions
- How would this estimate change if you only counted purchases, not browsing?
- What data source would you use to validate this number in practice?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 14: Get the job: the AI PM interview loop