THE ANNOUNCEMENT THAT Barack Obama would shortly appear on television came late in the evening on May 1st. "potus to address the nation tonight at 10/30pm eastern time," tweeted Dan Pfeiffer, communications director at the White House. This caused an explosion of speculation on Twitter. Had Muammar Qaddafi been killed in an air strike? Had Osama bin Laden been tracked down at last? At first these two theories had roughly equal support, measured by the volume of tweets. But then Keith Urbahn, chief of staff for Donald Rumsfeld, a former defence secretary, had a call from a well-connected television news producer who wanted to interview Mr Rumsfeld about the killing of bin Laden. Mr Urbahn tweeted: "So I'm told by a reputable person they have killed Osama bin Laden. Hot damn."
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