## 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 1. How would you determine whether adding Reels to the News Feed is **successful**? 2. What **metrics** would you define (primary + secondary/guardrails)? 3. 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.