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Re:Facebook Figured Out My Family Secrets, and It Won't Tell... by endorphone on Saturday August 26, 2017 @10:49AM (#15105672)
I don't use WhatsApp. Most of the people I know don't. People have appeared on my suggested contacts when I have no other connection with them.

Clearly Facebook uses many, many sources of data.

Re:Facebook Figured Out My Family Secrets, and It Won't Tell... by lazyjones on Saturday August 26, 2017 @12:27PM (#15106127)
> People have appeared on my suggested contacts when I have no other connection with them.

Have you considered the possibility that those other people have been searching for you on FB for some reason?