Determine Success Metrics for Instagram Video-Call Feature
Company: Meta
Role: Data Scientist
Category: Analytics & Experimentation
Difficulty: medium
Interview Round: Technical Screen
##### Scenario
After shipping the group video-call MVP, Instagram needs to track whether the feature drives engagement and retention.
##### Question
What business goals should define success for the new feature? Which engagement or retention metrics would you monitor and why? Should metrics measure overall app usage or the video-call module only? How would you define and calculate churn for this context?
##### Hints
Connect feature-level metrics to higher-level KPIs (DAU/WAU/MAU, session time, churn, latency) and explain trade-offs.
Quick Answer: This question evaluates a data scientist's competency in product analytics, experiment design, metric definition, and retention/engagement analysis for a social app's group video-call feature, focusing on practical application of adoption, activation, depth, retention, quality, and churn metrics.