Not so much cellphones as tracking devices: a surveilled day in the life of German politician Malte Spitz

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"Green party politician Malte Spitz sued to have German telecoms giant Deutsche Telekom hand over six months of his phone data that he then made available to ZEIT ONLINE. We combined this geolocation data with information relating to his life as a politician, such as Twitter feeds, blog entries and websites, all of which is all freely available on the internet."Interactive map here, article here, in Die Zeit (English). A related New York Times item is here.