Evaluate impact of short videos in feed

Q: Evaluate impact of short videos in feed

This is a System Design interview question from Meta for Data Engineer roles. View the full question and solution on PracHub.

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Question

Scenario

You work on a social app’s main News Feed. The team wants to introduce a short-form video module ("Reels") into the feed.

Prompt

How would you determine whether adding Reels to the News Feed is successful ?
What metrics would you define (primary + secondary/guardrails)?
How would you design an experiment / launch plan to measure impact?

Notes / Assumptions

The feed currently contains mixed content (text, images, long videos, links).
Reels may affect both consumption (viewing) and distribution (other content getting less exposure).
You have standard event logging for impressions, clicks, watch time, likes, comments, shares, hides, follows, etc.

Evaluate impact of short videos in feed

Scenario

Prompt

Notes / Assumptions

Solution

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