Why are Facebook News video previews failing to load for 35% of articles?

Introduction

Facebook News video previews failing to load for 35% of articles is a critical issue that directly impacts user engagement and content consumption. This analysis will systematically identify, validate, and address the root cause while considering both immediate and long-term implications for the product.

I'll approach this problem by first clarifying the context, then ruling out external factors before diving deep into the product mechanics, metric breakdown, and data analysis. From there, I'll form hypotheses, conduct root cause analysis, and propose validation methods and solutions.

Step 1

Clarifying Questions (3 minutes)

• Looking at the scope, I'm thinking this might be a recent issue. Has this 35% failure rate been consistent, or did it spike suddenly?

Why it matters: Helps determine if it's a new problem or an ongoing issue we've overlooked. Expected answer: A sudden spike in the last week. Impact on approach: A sudden spike would point towards recent changes or external factors.

• Considering user segments, I'm wondering if this is affecting all users equally. Are we seeing any patterns in terms of device types, operating systems, or geographical regions?

Why it matters: Identifies if it's a universal problem or specific to certain user groups. Expected answer: More prevalent on mobile devices, particularly Android. Impact on approach: Would focus our investigation on mobile-specific or Android-specific issues.

• Thinking about content types, I'm curious if this is happening across all article types. Is the 35% failure rate consistent across different content categories or publishers?

Why it matters: Helps isolate if it's a content-specific issue or a broader system problem. Expected answer: Fairly consistent across content types, slightly higher for video-heavy articles. Impact on approach: Would investigate video processing and delivery systems more closely.

• Considering recent changes, I'm wondering if we've made any updates to our video preview generation or delivery systems recently. Have there been any deployments or infrastructure changes in the past week?

Why it matters: Could quickly identify if a recent change is the culprit. Expected answer: A CDN configuration change was implemented last week. Impact on approach: Would focus on validating and potentially rolling back the CDN change.