Metrics question
How would you measure success if you were to build a Facebook Events feature from scratch?
- Meta
- Metrics
- Medium
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What this question tests
0-to-1 metric design for a discovery and coordination feature.
How to approach it
- State the goal: help users discover relevant events and coordinate attendance with friends.
- Propose funnel metrics: event views, RSVP rate, and attendance or check-in rate if measurable.
- Propose a north star, e.g. events attended per active user per month.
- Add a quality guardrail, e.g. RSVP-to-attendance ratio, to catch low-intent RSVPs.
- Note the cold-start challenge: enough event supply must exist before demand-side metrics matter.
- Note how you'd seed enough events at launch.
What a strong answer includes
- Distinguishes RSVP, an expression of intent, from actual attendance, the real value delivered.
- Names the cold-start and two-sided nature of events: organizers must create events before there's anything to discover.
- Picks events-attended-per-user as the north star, tying the feature to real-world outcomes not just app engagement.
- Flags RSVP-to-attendance ratio as a quality guardrail against vanity RSVP counts.
Common mistakes
- Measuring only RSVPs without considering whether people actually attend.
- Ignoring the supply side, event organizers, needed to bootstrap the feature.
Likely follow-up questions
- How would you measure actual attendance without requiring check-in?
- How would you seed enough events for the feature to be useful on day one?
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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