In order to define success metrics for videos on the Facebook Newsfeed, we need to consider several key factors. First and foremost, we need to understand the user behavior and preferences when it comes to consuming video content. This includes metrics such as view time, engagement (likes, comments, shares), and completion rate. We also need to consider the context in which the video is being viewed, such as the user's location, device, and internet connection speed. This can impact the user's ability to view the video, as well as their willingness to engage with it. Another important factor is the content of the video itself. We need to consider whether the video is relevant to the user's interests, whether it is informative or entertaining, and whether it provides value to the user. Metrics such as click-through rate, conversion rate, and retention rate can help us understand how the video is resonating with the audience. Ultimately, the success metrics for videos on the Facebook Newsfeed will depend on the goals of the campaign or initiative. For example, if the goal is to increase brand awareness, we may focus on metrics such as reach and impressions. If the goal is to drive sales or conversions, we may focus on metrics such as click-through rate and conversion rate. By understanding the user behavior and preferences, the context in which the video is viewed, and the content of the video itself, we can develop a set of success metrics that align with our goals and help us measure the impact of our video content on the Facebook Newsfeed.