Recently Malte Spitz, a German Green Party politician, sued Deutsche Telecom (parent of T-Mobile in the USA) requiring that they hand over six months of his smart phone data. Because he wasn’t in the USA, he actually won. He turned the information over to Zeit. They combined this information with Twitter feeds, blog entries, and other information freely available on-line.
If you go to the link you can see just how much of his life is no longer private to anyone with access.