Metrics question

How would you measure the success of Facebook Posts feature?

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 define a clean success metric for a core, foundational feature without overcomplicating it.

Clarify the goal of Posts: enabling users to share and receive engagement on content within their network.
North star: posts created per active user, reflecting healthy content creation, the core input to the whole feed ecosystem.
Supporting metric: engagement rate per post, likes, comments, and shares, reflecting whether posts resonate.
Guardrail: report or hide rate per post, ensuring content quality does not degrade as volume grows.
Segment: distinguish original posts from shares or reposts, since these reflect different user behaviors and value.
State why this differs from feed-level metrics like total time spent, since Posts specifically should be measured on creation and resonance, not passive consumption.

Chooses posts per active user as the north star, correctly reflecting that Posts is a creation feature, not a consumption feature.
Distinguishes original content from reshares, a meaningful behavioral segmentation for this specific feature.
Adds a content quality guardrail, report rate, appropriate for any open content creation surface.

Picking a feed-level consumption metric like total time spent, which does not isolate the Posts feature specifically.
No distinction between original posts and reshares.
No guardrail against declining content quality as volume increases.

How would you weigh original posts versus reshares in your north star metric?
What would falling posts per active user tell you, and what would you do about it?