Product design question

Design a movie product for Facebook.

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

Tests product design judgment on entering a content category already dominated by Netflix or YouTube, using the platform's specific strengths.

Clarify the real opportunity: social discovery and discussion around movies, not competing on content library.
Identify the user: someone deciding what to watch based on friends' opinions, not wanting a streaming service.
Design the mechanic: a 'what my friends are watching or rating' feed tied to existing Watch or Groups infrastructure.
Prioritize social-proof features, friend ratings and watch parties, over content licensing.
Avoid competing head-on on library size against Netflix; lean into the social graph as the differentiator.
Define success as movie-related engagement (ratings, watch-party joins) and return-visit rate.

Correctly identifies social discovery, not content licensing, as the real edge and designs around it.
Builds on existing infrastructure rather than proposing a new standalone streaming product.
Picks a success metric aligned with the social angle, not generic watch time.

Proposing to build a Netflix competitor with original content, ignoring licensing cost.
No connection to the platform's social graph as the differentiator.

How would you avoid this becoming spoiler-filled for people who haven't watched yet?
How would you measure if this is additive versus people discussing it elsewhere?
What would you build first?