It is very unfortunately, if this really happened, how they (Facebook) has violated the basic rights of its users with no permission.
I personally feel very in disadvantage with this incident, fortunately since active in Steemit about 6 months ago, I have very rarely update the status on Facebook, although my basic information and data has been stored since 6 years ago in their application.
What can I do for the next time?
Thank you @acidyo for this information.