Google does this pretty cool thing where they release transparency reports, which among other things explain how much the government is spying on US citizens' Google data without warrants. Via Slate:
For the first time, Google has broken down the kinds of legal processes authorities used to request access to the data. The company reported that 68 percent of the requests it received from government entities in the United States were made without a search warrant and instead via subpoenas, which it says “are the easiest to get because they typically don’t involve judges.”
The rising surveillance figures, which in part may be correlated to growth in the use of Google services, show that between 2010 and 2012, U.S. authorities’ requests for user data have increased by a whopping 85 percent (from 8,888 in 2010 to 16,407 in 2012). That trend has continued globally, with Google reporting that user data requests of all kinds have increased by more than 70 percent since 2009. In total, Google says it received 42,327 requests for information about 68,249 users from in 2012. That’s a jump of about 25 percent when compared with 34,001 requests about 53,904 users in 2011. Google complied with an average of 66.5 percent of the total requests it received in 2012.