Measure whether posts strengthen friendships

## Product question You are a Data Scientist on a social network. A stakeholder asks: **“Do posts help strengthen relationships between friends?”** ## Task Describe how you would **measure** whether posts strengthen friend relationships. Your answer should cover: 1. **Define “relationship strength”** (propose multiple candidate metrics and clarify tradeoffs). 2. A **measurement strategy** (observational analysis and/or experiment). 3. Key **confounders/biases** (e.g., homophily, activity level, feed ranking, reverse causality) and how you would mitigate them. 4. **Segmentation** you would use (e.g., new vs old friendships, weak vs strong ties). 5. What would convince you the feature is helping vs merely correlating with strong friendships already.