This question evaluates a data scientist's competency in causal inference, user-behavior analytics, and experimentation design for social platforms, focusing on measuring how parental presence influences teen engagement.

Context: Facebook’s teen audience (ages 13–17) increasingly overlaps with their parents, who may friend their children, comment on their posts, and react to content. Leadership is concerned that parental presence may cause teens to churn or self‑censor. You are asked to measure behavioural shifts and design mitigations that retain both teens and parents.
Assumptions (for clarity):
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