Scenario: Facebook’s core audience is aging, and parents are now friending their teenage children, commenting on photos, and reacting to posts. Leadership is concerned that parental presence could drive teens to churn or self‑censor. You are tasked with measuring these behavioural shifts and designing mitigations that keep both demographics active. ​ Question 1: How does parental presence on Facebook affect teens’ engagement and behaviour? (Hint: activity rate, content‑sharing, privacy‑setting changes) Question 2: What data‑driven signals would you combine to identify parent‑child relationships on Facebook? (Hint: social graph, shared surnames, family tags, private‑message patterns) Question 3: When parents join and teens churn, how would you balance experiences for both segments to sustain overall engagement? (Hint: product segmentation, privacy controls, ranking tweaks)