Information on the people you call can give away more than you think. Jonathan Mayer at Stanford University, California, asked 546 volunteers to download the MetaPhone app, which logged who people called, but not what was said – similar to the metadata the US National Security Agency has been collecting. From this he could work out a lot about people’s lives, he wrote on his blog. For example, it suggested that one person got an abortion, as she placed multiple calls to a Planned Parenthood Centre after a long call with her sister.
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