This question requires you to identify and discuss the particular ways in which Facebook Messenger has been enhanced. You should consider several metrics, including speed, ease of use, security, features, and compatibility across various platforms. The interviewer is likely assessing your analytical abilities, your familiarity with Facebook Messenger, and your capacity to effectively evaluate product improvements. In your response, you could mention specific changes you've noticed, your thoughts on the reasons behind these changes, and how these enhancements affect the overall user experience.