Product design question

How would you improve Facebook Marketplace?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Tests product sense on a two-sided marketplace where trust and discovery are the actual bottlenecks, not just UI polish.

Segment users: casual local sellers, frequent resellers, and buyers browsing versus buyers with a specific item in mind.
Identify the top pain point: buyer trust in item condition and seller reliability, since Marketplace has weaker vetting than a dedicated resale app.
Identify a discovery pain point: search and category browsing is weaker than intent-based apps, making it hard to find specific items.
Propose a fix: a lightweight seller rating and verified-item-condition photo requirement, paired with better search filters (price, distance, condition).
Define success as completed-transaction rate and repeat buyer rate, since trust improvements should show up in both.

Identifies trust, not UI, as Marketplace's real gap versus dedicated resale apps like Poshmark or eBay.
Separates buyer-side and seller-side improvements clearly rather than proposing one undifferentiated fix.
Uses an illustrative number, e.g. assume only 30% of buyer-seller conversations convert to a completed sale, to motivate the trust fix.
Picks completed-transaction and repeat-buyer rate as success metrics, tying directly back to the trust problem identified.

Suggesting generic UI polish (better photos, nicer layout) without addressing the trust gap.
Not distinguishing between local peer-to-peer sales and shipped e-commerce-style sales, which need different trust mechanisms.

How would you prevent fake or scam listings without adding too much friction for sellers?
How would you measure whether the new rating system actually increased trust?