Imagine you are PM at Facebook. You walk into your office one day and see Messenger DAU are down by 10%. Why?

Introduction

A 10% drop in Messenger's Daily Active Users (DAU) is a significant issue that demands immediate attention and a thorough investigation. As the PM at Facebook, I'll approach this problem systematically, considering various factors that could contribute to such a substantial decline in user engagement.

Step 1

Clarifying Questions (3 minutes)

• What's the exact time frame for this 10% DAU drop?

• Are there any specific user segments more affected than others?

• Have we recently rolled out any major updates or changes to Messenger?

• Are there any known technical issues or outages during this period?

• Has the method for measuring DAU changed recently?

• Are we seeing similar trends in other Facebook products or is this isolated to Messenger?

Why these questions matter: Understanding the context and scope of the issue is crucial for accurate analysis. Hypothetical answers could significantly alter our approach:

1. Time frame: If it's a sudden drop, it might indicate a technical issue. If gradual, it could suggest a shift in user behavior or competitive pressure.
2. User segments: Knowing if it's affecting specific demographics or regions could point to localized issues or cultural shifts.
3. Recent updates: A new feature or UI change could be driving users away if poorly received.
4. Technical issues: Outages or bugs could explain a temporary drop in usage.
5. Measurement changes: Ensuring our metrics are consistent is crucial for accurate analysis.
6. Cross-product trends: This helps determine if it's a Messenger-specific issue or a broader Facebook ecosystem problem.