Also scary. I have never ever logged in to Facebook on my iPhone except via the Facebook app and it was the first time I've installed Zoom. When I went into the Zoom app and picked login via Facebook, somehow it knew who I was and asked if I wanted to login as me. How is this possible? Is iOS sharing cookies across apps? I feel like maybe I need to reset my phone. WTF
I also feel like the best solution for this case is to somehow login via the facebook app. I know that used to be an option but it seems facebook deprecated it. My argument would be (a) I don't have to worry Zoom (or any other app) is getting my Facebook credentials (b) If actually do want to login via Facebook it's almost guaranteed I have the app installed.