This question evaluates product analytics and experimentation skills by probing the ability to define engagement and growth metrics, prioritize improvements for large versus small online community groups, and estimate the market opportunity for a local-groups feature.

You are evaluating Facebook Groups and a potential new feature called "Circle." Assume Circle is a lightweight, proximity-based local-groups feature (e.g., join or create micro-groups within a small geographic radius such as your neighborhood). Your task is to define success metrics, outline how to prioritize improvements differently for large vs. small groups, and estimate the opportunity size for the local-groups (Circle) feature.
Consider engagement per member, active membership growth, content quality, and marginal impact.
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