Strategy question

How would you decide if you should build a "Products you might want to buy" feature on the Facebook Marketplace newsfeed?

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

Whether you can size an opportunity and decide if a feature is worth building, not just design it.

Clarify the goal: is this about GMV for sellers, discovery for buyers, or ad revenue.
Define the target user, likely newsfeed browsers who are not actively searching Marketplace.
Size the opportunity using daily active newsfeed users, click through rate on similar units, and conversion to purchase.
Weigh the cost: engineering to build a recommendation model, and the risk of feed clutter hurting session time.
Compare against alternatives like a dedicated Marketplace tab or push notifications.
State a go or no go recommendation tied to a target lift in Marketplace GMV.

Ties the decision to a single metric, for example a 3 percent lift in Marketplace transactions per newsfeed session (assumption).
Flags cannibalization risk: ads and organic posts already compete for feed slots.
Proposes an A/B test with a holdout before committing full engineering resources.
Separates cold start (no purchase history) users from users with browsing signal.

How would you rank this against other feed features competing for the same slot?
What signals would you use to personalize the recommendations?