Metrics question
The Facebook Messenger usage is down. Figure out why. What would you do?
- Meta
- Metrics
- Medium
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What this question tests
Tests structured root-cause diagnosis for a usage decline in a core messaging product, requiring segmentation before proposing action.
How to approach it
- Clarify the metric: define usage precisely, DAU, messages sent per user, or session frequency, and confirm the size and timeframe of the decline.
- Rule out measurement issues: check for a tracking change or a recent SDK update before assuming real behavior changed.
- Segment the decline: by platform, region, and user tenure, since a broad decline concentrated in one segment points to a specific cause.
- Check for a recent product change: a redesign, a new default setting, or a recent feature removal that could have reduced usage.
- Check for external substitution: growing use of a competing app, iMessage, WhatsApp, or Instagram DMs, among the same user base.
- Prioritize hypotheses by segment size affected and speed of verification, comparing usage trends against Meta's own other messaging products first.
What a strong answer includes
- Checks measurement validity and segments the decline before hypothesizing a cause, avoiding a jump to conclusions.
- Names a specific, realistic external cause, substitution toward WhatsApp or Instagram DMs, both owned by the same parent company, a nuanced real possibility.
- Separates internal product changes from external substitution as distinct hypothesis categories.
- Proposes a concrete, fast verification method, comparing trends across Meta's own messaging products in the same regions.
Common mistakes
- Assuming a single cause without segmenting the decline by platform, region, or tenure.
- Ignoring that usage may simply be shifting to another Meta-owned messaging app, not disappearing entirely.
Likely follow-up questions
- How would you distinguish decline due to WhatsApp substitution from a genuine loss of engagement?
- What would you check first if the decline were concentrated among teen users?
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More questions from Meta
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