The ‘nothing to hide’ argument to an erosion of privacy raises a few problems. Firstly, it’s based on a narrow definition of privacy; a right to keep secrets – only criminals need to keep secrets. The ‘no junk mail’ sign on letterboxes suggests people might expect privacy to include a right to not receive unwanted advertisement. Secondly, algorithms build very detailed impressions of people from small bits of information we all happily share. These digital mosaics are analysed to find...

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