… with assistance from all the telephone and internet companies, such as ISPs, search engines, and social networks. The basic message from Christopher Soghoian is: You have no privacy on the web, especially from the government.
The talk is a bit long and gets a bit technical at times but is fascinating and depressing at the same time.
At the end, he reveals which cell-phone carrier is best for privacy and why. (Spoiler alert: it is T-mobile.)
(Thanks to Jonathan)