When Twitter Rogues Move Markets: A Timeline

Traders on the New York Stock Exchange floor on April 23 Photograph by John Moore/Getty Images

On April 23, a tweet sent from the official Associated Press Twitter account reporting that an explosion at the White House had injured President Obama caused the Dow to drop 140 points and wiped $136 billion from the S&P 500. The incident came shortly after the U.S. Securities and Exchange Commission announced that companies can use social-media sites such as Twitter and Facebook to share market-moving company announcements.

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