In Germany, Malte Spitz asked his cell phone carrier what it knew about him. After some unanswered requests and a lawsuit , he received 35,830 lines of code -- a detailed account of six months of his life. You can watch the video below and 'browse' through it here.
The little concern I'd have about our digital traces being used for totalitarian purposes gets somewhat overshadowed by the overwhelming number of studies it opens.
