What is the Facebook app hash key?
Could you please clarify what the Facebook app hash key is? Is it a unique identifier that is used for security purposes within the Facebook app? If so, how is it generated and what role does it play in ensuring the safety and privacy of users' data? Also, is it necessary for all developers who are creating apps that integrate with Facebook to obtain one? Additionally, what are the potential consequences of misusing or sharing the Facebook app hash key?