The success metrics for Facebook stories can be measured in a number of ways. One common metric is the number of daily active users who engage with stories. This metric can be further broken down by demographics and location to gain a better understanding of who is using stories and how they are using them. Another important metric is the number of shares and views that stories receive. This can help to determine which stories are resonating with users and which ones are not. Additionally, tracking the time spent viewing stories can provide insights into how engaging the content is. Engagement rate is another key metric for Facebook stories. This metric measures the percentage of users who view a story and then take an action, such as clicking a link or swiping up to learn more. This metric can help to determine how effective stories are at driving user engagement and conversions. Finally, it is important to track the impact that stories have on overall user retention and satisfaction. By monitoring user behavior and feedback, product managers can gain a better understanding of how stories are contributing to the overall success of the platform.