I had post this problem to Facebook community here :
The story is, I added my colleague few days ago by Line (messenger) and added by Line ID (not phone number), and I had her mobile number in my Google contact already long time ago.
Yesterday, I saw my colleague appeared in suggest list from Facebook.
As attachment, I just leave Facebook app read my Storage only (to send photos) , and then all other permission i won’t grant.
My question is : “How Facebook know about it?”
As Line Database is encrypted (i remembered it is) and i’m quite worry this thing happens , Facebook app will read everything or able to decrypt in phone storage (even SD card) , I hope Facebook will reply this .