This question evaluates a data scientist's competency in product analytics, causal inference, and experimentation design for comparing performance across two competing ephemeral story features, emphasizing clear metric definition for creators, viewers, monetization, and ecosystem effects.

You are a data scientist tasked with quantitatively comparing the success of Instagram Stories versus Facebook Stories.
Hints: Consider DAU posting, views per story, completion rate, time spent; consider matched-pairs or A/B tests across markets.
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