Metrics question
Why do Facebook Marketplace exist? What are its goals?
- 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
Tests the ability to articulate a product's purpose and goals clearly, distinguishing user value from business value for a specific, well-known product.
How to approach it
- State the user need Marketplace serves: a trusted, local, low-friction way to buy and sell secondhand goods without leaving Facebook.
- State why Facebook built it: to increase engagement and time spent by adding a high-intent use case (commerce) to an existing social graph.
- List the primary user-facing goal: successful local transactions completed, not just listings created.
- List the business goal: incremental engagement and, longer term, monetization through ads or seller fees.
- Note the trust and safety goal as a guardrail: reducing scams and fraudulent listings, since trust is the core constraint on a peer-to-peer marketplace.
What a strong answer includes
- Separates the user-facing purpose (easy local buying and selling) from Facebook's business motivation (engagement and future monetization), rather than conflating the two.
- Names successful completed transactions, not listing volume, as the real goal, since listings alone do not prove value.
- Flags trust and safety as a core goal, not an afterthought, given Marketplace's peer-to-peer, unvetted-seller structure.
- Ties the product back to Facebook's existing asset (the social graph and Groups) that gives Marketplace its distribution advantage.
Common mistakes
- Describing Marketplace only as a listings feature without tying it to Facebook's engagement or monetization goals.
- Ignoring trust and safety as a fundamental constraint on the product's growth.
Likely follow-up questions
- How would you measure a 'successful' transaction if Facebook does not process the payment?
- How would you balance growing listings volume against maintaining buyer trust?
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