Metrics question
You are the Product Manager of Instagram Reels, and you have just released it to 150 countries. Set goals and success metrics for Instagram Reels.
- Meta
- Metrics
- Hard
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What this question tests
Tests metrics design for a global consumer feature at scale: can you build a goal-and-metric tree that fits a 150-country launch, including localization concerns.
How to approach it
- Clarify the launch goal: is this about growing usage, competing with TikTok, or driving overall Instagram engagement, since the metric tree differs by goal.
- State the top-level goal: Reels becomes a durable daily habit and a meaningful share of Instagram's total time spent.
- Break into a metric tree: acquisition (percent of Instagram users who try Reels), engagement (Reels plays per DAU, average watch time), creation (percent of users who post a Reel weekly), and retention (Reels-specific D7/D30 return rate).
- Add guardrails: overall Instagram session time should not drop (cannibalization check), and content quality signals like report rate should stay flat.
- Account for the 150-country rollout: segment metrics by region maturity, since a country with low creator supply will look different from the US early on.
- Name the North Star candidate: Reels watch time per DAU, since it captures both breadth and depth of adoption.
What a strong answer includes
- Distinguishes consumption metrics (watch time, completion rate) from creation metrics (posts per creator), since a video product needs both supply and demand to work.
- Adds a cannibalization guardrail explicitly: total Instagram time spent should not decline as Reels grows, an assumption worth stating clearly.
- Segments goals by market maturity, noting that a newly launched country needs a creator-supply goal before a consumption goal makes sense.
- Picks one clear North Star (Reels watch time per DAU) instead of listing ten metrics with no hierarchy.
Common mistakes
- Listing metrics with no structure or hierarchy, so the interviewer cannot tell what matters most.
- Ignoring that a 150-country launch has wildly different creator density and content supply by region.
- No guardrail metric, missing the cannibalization risk against Instagram's core feed.
Likely follow-up questions
- How would you prioritize among countries with very different starting Reels supply?
- What would make you conclude the launch is failing in a specific region?
- How would you separate genuine engagement from passive autoplay watch time?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 14: Get the job: the AI PM interview loop