Zoom’s Use of Facebook’s SDK in iOS Client
It seems that Facebook JS SDK also sends user behavior back to Facebook even when user doesn't click on the "Sign in with Facebook" button: https://simplelogin.io/blog/do-not-use-facebook-sdk/On the Web, it's recommended to use a generic OAuth library instead of integrating Facebook JS SDK. On mobile, this is almost impossible though as Facebook doesn't implement the OAuth PKCE flow.