Major U.S. technology companies have largely ended the practice of quietly complying with investigators’ demands for e-mail records and other online data, saying that users have a right to know in advance when their information is targeted for government seizure.
http://www.washingtonpost.com/business/technology/apple-facebook-others-defy-authorities-increasingly-notify-users-of-secret-data-demands-after-snowden-revelations/2014/05/01/b41539c6-cfd1-11e3-b812-0c92213941f4_story.html