In an anonymous industrial park, CIA analysts who jokingly call themselves the "ninja librarians" are mining the mass of information people publish about themselves overseas, tracking everything from common public opinion to revolutions.
The group's effort gives the White House a daily snapshot of the world built from tweets, newspaper articles and Facebook updates.
The agency's Open Source Center sometimes looks at 5 million tweets a day. The analysts are also checking out TV news channels, local radio stations, Internet chat rooms — anything overseas that people can access and contribute to openly.
CIA Analysts Comb Social Media For Trouble Spots