Define success for the For You Feed
Measure successMediumProblem. The For You Feed drives 50% of GMV. A PM asks you to define what success looks like for it, so the team has something to optimize. What do you propose?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.