Define Facebook Marketplace's Purpose, Goals and North Star Metric

Facebook Marketplace lets people buy and sell physical items with one another, much like online classified ads. Explain why Meta runs it and what it is meant to achieve, and then show how you would measure whether it is meeting those goals. Take these points as given: - It is a two-sided marketplace: sellers list physical goods, and buyers browse the listings and contact sellers. - The sale happens away from the platform. Meta does not see payment or hand-over; the only signal it gets is a seller taking a listing down, and the item may have been sold through a completely different channel. - Marketplace is a mature product, not a new launch. ### Clarifying Questions - Do sellers include businesses such as car dealers that list large inventories, or should I focus on individuals selling their own items? - Should success be judged only on Marketplace itself, or also on what it contributes to Facebook as a whole, such as return visits to the app? - Should advertising revenue from Marketplace count as one of its goals, or only as a downstream result of engagement? ### Part 1 — Why Marketplace exists Explain what Marketplace offers buyers and sellers, why Facebook is a natural home for it, and what Meta gains from running it. ```hint Three beneficiaries Work out separately what the buyer, the seller and Meta each get, and what Facebook's real identities, friend networks and Groups add that a classifieds site cannot. ``` #### What This Part Should Cover - The value to each side, and what Facebook in particular adds to trading between individuals. - The link to Meta's mission and to its business: engagement, return visits and advertising. - What the product's maturity implies for its purpose today. ### Part 2 — Set goals and measure them State Marketplace's goals at its current stage, map the buyer and seller journeys with a measurable signal at each step, and propose a north-star metric together with supporting and counter metrics. Your metrics must work even though a completed sale is never observed. ```hint The last thing you can see With the sale invisible, find the latest point in the journey that shows both sides getting value, then check how a metric built on it could be inflated without anyone actually trading. ``` #### What This Part Should Cover - Buyer and seller funnels with a metric for each stage. - A north-star metric that reflects value to both sides without transaction data, with its blind spots stated. - Supporting metrics for supply, demand and liquidity, and counter metrics for trust, quality and spam. ### What a Strong Answer Covers - Goals that follow from the reasons the product exists, not a generic list of metrics. - Explicit treatment of the two-sided dynamic: keeping supply and demand in balance so listings get interest and buyers find items. - Honest handling of the offline-sale blind spot and of the proxies used in its place. - Trade-offs such as engagement against quality, and Marketplace's effect on the rest of Facebook. ### Follow-up Questions - Your north-star metric climbs sharply over a quarter, but reports of scams climb too. How do you decide whether Marketplace is healthier? - Meta adds checkout and shipping in some markets, so completed sales become visible there. How would your metrics change? - How would you tell whether Marketplace adds to total Facebook engagement or only moves time away from the feed and Groups?