This question evaluates a data scientist's competency in product analytics, experimentation design, launch metric definition, and causal attribution for feature cannibalization across two social apps, and sits in the Analytics & Experimentation domain for a Data Scientist role.

You are evaluating the rollout and impact of Stories, an ephemeral sharing format similar to Snapchat, across two apps: Instagram and Facebook. Stories may increase engagement but could cannibalize Feed posts. You are asked to define evaluation criteria, launch decisions, mitigation strategies for cannibalization, and explain cross‑app performance gaps, including an experiment design.
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