McLEAN, Va. -- 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, local radio stations, Internet chat rooms -- anything overseas that people can access and contribute to openly.

From Arabic to Mandarin, from an angry tweet to a thoughtful blog, the analysts gather the information, often in a native tongue. They cross-reference it with a local newspaper or a clandestinely intercepted phone conversation. From there, they build a picture sought by the highest levels at the White House. There might be a real-time peek, for example, at the mood of a region after the Navy SEAL raid that killed Osama bin Laden, or a prediction of which Mideast nation seems ripe for revolt.

Yes, they saw the uprising in Egypt coming; they just didn't know exactly when revolution might hit, says the center's director, Doug Naquin.

The center already had "predicted that social media in places like Egypt could be a game-changer and a threat to the regime," he said in an interview.

The CIA facility was set up in response to a recommendation by the 9/11 Commission, its first priority to focus on counterterrorism and counterproliferation.

The center's several hundred analysts track a broad range of subjects, including Chinese Internet access and the mood on the street in Pakistan. But, a spokeswoman said, "There is no effort to collect on Americans." The center's analysis ends up in President Barack Obama's daily intelligence briefing.

Naquin says the next generation of social media will probably be closed-loop, subscriber-only cellphone networks, like the ones the Taliban uses to send messages among hundreds of followers at a time in Afghanistan and Pakistan. Those networks can be penetrated only by technical eavesdropping by branches of U.S. intelligence -- but Naquin predicts his covert colleagues will find a way to adapt, as the enemy does.

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