The Tweet that rocked Wall Street: $200 billion lost on fake message

That was the costly lesson learned as a tweet allegedly from the Associated Press reported two explosions in the White House and that President Barack Obama had been injured. Within minutes AP personnel swung into damage control, attempted to reassure the tweet was a hoax. But the damage was already done: The bogus message sent the Dow Jones Industrial Average into a tailspin, shaving 150 points, or about 1 percent, in the blink of an eye.

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