“The winners, that is those who require a warrant before giving up information and who also inform you of government requests, are: Dropbox; Foursquare; LinkedIn; Sonic.net; SpiderOak; Twitter; WordPress. The companies that roll over and immediately give up information and also don’t notify you that you are the subject of a government request: Amazon; Apple; AT&T; Comcast; MySpace; Verizon; Yahoo. Google and Microsoft require a warrant before they provide information about you, but don’t notify you that you are the subject of a government request.”
http://www.economicpolicyjournal.com/2013/05/privacy-companies-that-are-best-at.html