This prompt requires you to develop the application programming interfaces (APIs) for the comment functionality in Facebook Live. Facebook Live enables users to stream video live to their friends or followers, who can comment while viewing. In designing these APIs, consider essential features such as creating comments, fetching comments, modifying comments, and removing comments. Additionally, you should address the challenges associated with a live commenting system, including handling large data volumes, ensuring real-time updates, and safeguarding privacy and security.