Metrics question
Imagine you were in charge of Facebook Watch. What metric would you want to measure?
- Meta
- Metrics
- Easy
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
Start a mock interview on this question · Mock interview from a job description
What this question tests
Picking a north star for a video platform competing for attention against dedicated video and short form platforms.
How to approach it
- State the goal, building a habit of intentional video watching, competing directly with established video platforms.
- Propose the north star, average watch time per active viewer per week, since it reflects real sustained interest, not just a single click.
- Add a content health metric, percent of watch time from creators earning ad revenue, since creator supply sustainability matters long term.
- Add a guardrail, video completion rate, to ensure watch time is not inflated by autoplay without real attention.
- Segment the metric by content type, short clips versus longer shows, since success looks different for each.
What a strong answer includes
- Picks a specific north star, watch time per active viewer per week, over a vague engagement metric that could include passive autoplay.
- Adds a completion rate guardrail specifically to catch inflated watch time from autoplay without genuine attention.
- Ties in the creator ecosystem health metric, since long term success depends on creators finding it worth publishing to.
Common mistakes
- Reusing generic feed metrics like likes or shares instead of video specific engagement metrics.
- Ignoring the creator supply side of the platform entirely.
- No guardrail against autoplay inflating watch time artificially.
Likely follow-up questions
- How would you weigh short clips versus longer form shows in this metric?
- How would you know if watch time growth was healthy versus just autoplay driven?
More metrics questions
- How would you measure the success of Facebook Likes?Meta · Metrics · Medium
- How would you measure improvements made to Facebook messenger?Meta · Metrics · Easy
- Imagine you are the PM in charge of Reactions on Facebook - the new way to interact with posts by using “love”, “haha”, “wow”, “sad”, and “angry” reactions. What would success look like in terms of number of non-like reactions per post at launch and how do you come up with this? Would this number differ by reaction? Why or why not?Meta · Metrics · Hard
- You launched a new signup flow to encourage new users to add more profile information. A/B test results indicate that the % of people that added more information increased by 8%. However, 7 day retention decreased by 2%. What do you do?Google · Metrics · Hard
- Define the metrics for YouTube search.Google · Metrics · Medium
- You are the PM of Instagram app. The MAU has been constant but DAU has declined. What will you do?Meta · Metrics · Medium
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