If you are a user of Facebook, Twitter, LinkedIn, YouTube, Craigslist or another popular site, the U.S. security state is watching you. An increasing number of federal agencies are employing sophisticated means to monitor Americans' use of social networking sites. Federal entities from the National Security Agency (NSA) and the Defense Department to the Department of Homeland Security (DHS) to even the Internal Revenue Service (IRS) are involved in developing programs to track the American public online.

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