Determine Metrics to Evaluate Notification Impact on Users

##### Scenario Facebook has multiple types of push notifications and is considering launching a new one that tells you a friend plans to attend an event. ##### Question Which data and metrics would you use to determine whether an existing notification is helpful or harmful to users? What analyses or experiments would you run to decide whether to launch the new event-based notification? ##### Hints Think funnel metrics, user experience trade-offs, A/B tests, downstream engagement and churn.