To measure the success of Facebook's Campus feature, we need to establish clear metrics that align with the goals of the product. One potential metric could be user engagement, which could be measured by the amount of time that users spend on the platform, the number of posts and comments that they make, and the number of interactions that they have with other users. Another potential metric could be user retention, which could be measured by the percentage of users who return to the platform on a regular basis. In addition to these metrics, it's also important to gather feedback from users to understand their experience with the product and identify areas for improvement. This feedback can be collected through user interviews, surveys, and other forms of user research. Overall, the success of Facebook's Campus feature will depend on how well it meets the needs of its target audience and how effectively it engages and retains users. By establishing clear metrics and gathering feedback from users, we can track the success of the product and make adjustments as needed to ensure that it continues to meet the needs of its users.