Regarding the blue checkmarks on Instagram, I would define success as a notable decrease in impersonation and fraud, enhanced user trust in the platform, and a subsequent increase in user engagement. To evaluate this success, I would concentrate on metrics such as: The count of impersonation reports before and after the implementation of the feature. User surveys or feedback regarding their trust levels and perception of Instagram's authenticity following user verification. Indirect effects on user engagement, which could include assessing changes in active users, the amount of time spent daily on the app, and interactions with verified versus non-verified accounts. To collect these metrics, a mix of utilizing existing analytics tools or data from Instagram and creating feedback forms or surveys for users would be necessary. It would be crucial to clean, analyze, and interpret the data. A strong conclusion would ideally emerge from integrating various data sources and checking for consistency in their results.