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Re:Facebook Lies by AndrewStephens on Tuesday October 03, 2017 @10:50AM (#15392772)
You are correct, of course, although this was not so widespread at the time I wrote this piece (sometime in 2007 I think, despite what the byline claims.)
Re:Facebook Lies by scott_karana on Tuesday October 03, 2017 @03:23PM (#15395268)
They've done it from the start.

Even 2007-era Facebook encouraged users to upload/sync their email contacts to "discover friends already using it".