Evaluate Messenger's P2P Payments Feature for Business Viability

##### Scenario Facebook Messenger considers launching a Venmo-like peer-to-peer payments feature. ##### Question Is adding P2P money transfer in Messenger worthwhile from a business perspective? What business goals and success metrics would you track? List possible negative impacts or risks of launching this feature. How could the feature be monetized? Design an experiment or pilot/beta test to measure impact. Which variants, sample sizing, and duration would you choose? Which metrics determine whether the feature met expectations? How would you compare user engagement between beta participants and non-participants (e.g., difference-in-difference)? If a control-group user wants access to the feature, how would you handle the contamination risk? ##### Hints Define north-star metric, guard against spillover, consider A/B vs. geo holdout, outline causal inference assumptions, quantify revenue paths.