The arduous task, carried out by a team known as the “Vengeful Librarians,” includes sifting through more than 5 million tweets a day. (In total, Twitter’s 100 million users publishapproximately 140 million tweets every day.) Doing so has enabled the CIA to view how events in the US are being received overseas — like, say, the assassination of Osama bin Laden — as well as allowing the agency to keep tabs on international events, like the uprising in Egypt this spring.
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