What Does Facebook Know About You?

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Facebook now say Cambridge Analytica had access to 87 million accounts

“It is reasonable to expect that if you had that [default] setting turned on, that in the last several years someone has probably accessed your public information in this way
Mark Zuckerberg (BBC News)
Mark Zuckerberg has said that 1.1 million of the accounts improperly accessed by the political consultancy were from UK based users. He said that some malicious services had used a facility that allowed them to link the public profile of a user to an email or mobile phone number acquired elsewhere. Read more