You're a PM at Meta. How would you measure the success of the 'Report Ad' feature for Ads, considering false positives and false negatives?

Focus on defining key performance indicators (KPIs) that reflect both user engagement with the 'Report Ad' feature and the accuracy of the reporting system. Consider metrics such as the number of reports submitted, the percentage of reports leading to actionable outcomes, and user satisfaction ratings post-reporting. Address the balance between false positives (legitimate ads reported) and false negatives (problematic ads not reported) by proposing a method to track and analyze these instances. Discuss how you would gather qualitative feedback from users to refine the feature and improve its effectiveness over time.