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A comment on What Data Does Facebook Collect When I’m Not Using Facebook, and Why?. Parent comment

Re:What Data Does Facebook Collect When I’m Not Using Facebo... by mgummelt on Monday April 16, 2018 @05:18PM (#16852879)
They don't allow advertisers to target non-users. I'm sure they use non-user data for clustering, just as you described.

They also probably use it when the user finally does create a FB account.

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