Google’s Report on NSLs: What we still don’t know

Every year, the FBI issues tens of thousands of “national security letters”—or NSLs—demanding that internet service providers, telephone companies, credit card companies, and others hand over information about their customers if it is “relevant” to a counterterrorism or counter-intelligence investigation. That information could include the web sites we visit, the email addresses of our contacts, or even information linking us to our anonymous political speech online. This practice has been shrouded in secrecy, though, because the FBIgags recipients of NSLs—preventing companies from telling their customers that the government has asked for records about them.

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http://www.aclu.org/blog/national-security-technology-and-liberty/googles-report-nsls-what-we-still-dont-know