Raytheon, one of the largest defense contractors, has created software designed to track users and gather information on users of social media, such as facebook, twitter, and countless others.
The analytics software is known as RIOT (rapid information overlay technology)
While Ratheon claims to have not yet sold the software to any clients, they have admitted sharing it with the US Government in 2010 to help build a national security system capable of analysing trillions of entities.
The UK newspaper The Guardian broke the story here
And this is the video from Ratheon the Guardian obtained