What integrations and third-party apps are available within Facebook Messenger to enhance user experience?
How do Messenger's group chat and video call functionalities work, and what is the maximum number of participants allowed?
Can Messenger be used without a Facebook account, and if so, what are the limitations?
How does Facebook Messenger ensure the privacy and security of its users' messages?
What are the key features of Facebook Messenger, and how do they compare to other messaging apps?
