Through a top-secret program authorized by federal judges working under the Foreign Intelligence Surveillance Act (FISA), the U.S. intelligence community can gain access to the servers of nine Internet companies for a wide range of digital data. Documents describing the previously undisclosed program, obtained by The Washington Post, show the breadth of U.S. electronic surveillance capabilities in the wake of a widely publicized controversy over warrantless wiretapping of U.S. domestic telephone communications in 2005. These slides, annotated by The Washington Post, represent a selection from the overall document, and certain portions are redacted.
http://www.washingtonpost.com/wp-srv/special/politics/prism-collection-documents/

The National Security Agency and the FBI are tapping directly into the central servers of nine leading U.S. Internet companies, extracting audio and video chats, photographs, e-mails, documents, and connection logs that enable analysts to track foreign targets, according to a top-secret document obtained by The Washington Post.
http://www.washingtonpost.com/investigations/us-intelligence-mining-data-from-nine-us-internet-companies-in-broad-secret-program/2013/06/06/3a0c0da8-cebf-11e2-8845-d970ccb04497_story.html

This is a good reason to be wary of American companies!