For Facebook Live, the North Star metric could be the number of minutes watched per user per day. This metric aligns with the goal of increasing engagement and time spent on the platform. To achieve this, we could focus on improving the user experience of Live, such as by increasing the discoverability of Live content and making it easier for users to interact with Live videos. When evaluating the trade-off between promoting People You May Know (PYMK) and Live content on Facebook, we should consider the impact on our North Star metric. Promoting PYMK could increase user engagement and time spent on the platform, but it may not align with the goal of improving the Live experience. On the other hand, promoting Live content could directly contribute to our North Star metric, but it may not have as significant an impact on overall user engagement. Ultimately, we should prioritize the strategy that best aligns with our North Star metric and overall product goals.