To measure success for a Facebook travel recommendation product, we would need to define clear and measurable key performance indicators (KPIs) that align with the goals of the product. Some potential KPIs for a travel recommendation product could include: 1. User engagement: This could be measured through metrics such as the number of users who interact with the product, the number of recommendations viewed, and the amount of time spent on the platform. 2. User satisfaction: This could be measured through metrics such as user feedback, ratings, and reviews. We could also conduct surveys to gather additional qualitative feedback on the product. 3. Conversion rate: This could be measured by the percentage of users who book trips or make purchases through the platform. 4. Revenue: This could be measured by the total amount of revenue generated by the product, including both commissions from bookings and advertising revenue. 5. User retention: This could be measured by the percentage of users who return to the platform after their initial interaction. We could also measure the frequency of return visits and the amount of time between visits. In addition to these KPIs, we would need to ensure that we are collecting and analyzing data on user behavior and interactions with the product. This could include tracking user journeys, identifying patterns in user behavior, and conducting A/B tests to optimize the user experience. Overall, measuring success for a Facebook travel recommendation product requires a combination of quantitative and qualitative metrics, as well as a deep understanding of user needs and behaviors. By regularly tracking and analyzing these metrics, we can ensure that the product is meeting its goals and continually improving the user experience.