Metrics question

You are the PM for FB Story. What metrics would you pick for success?

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

Metrics design for an ephemeral content format, requiring the right balance between creation, consumption, and platform health.

Confirm the business goal: increasing daily engagement or growing an ad inventory surface through Stories.
Split metrics into creation side, story posts per active user, and consumption side, story views per user.
Add a completion metric, percent of story fully viewed, as a proxy for content quality.
Add a north star, such as daily active story users, that ties creation and consumption together.
Include a guardrail, such as story related reports or hides, so growth does not come from spammy content.

Splits the metric tree cleanly into creation and consumption sides, since Stories succeed only if both grow together.
Uses completion rate as a quality proxy, a known real signal used for ephemeral content formats.
Names a north star, daily active story users, that ties the two sides into one number for leadership.
Adds a guardrail against spam or low quality content, relevant given ephemeral formats are easy to game.

Tracks only views, missing that creation is the harder, more valuable side to grow.
Has no quality or health guardrail metric.

Which of these metrics would you make the single headline number for leadership?
How would you detect if creation is growing but from low quality, spammy posts?
How would you compare this to Instagram Stories' own historical metrics?