Hoax tweet tests firms that filter social media for Wall Street
By Ryan Vlastelica NEW YORK (Reuters) – Firms that scour social media sites such as Twitter for information to help investors and traders make money faced their biggest test yet this week. A tweet reporting explosions at the White House appeared on the Associated Press’s official feed Tuesday afternoon, sparking a temporary sell-off that briefly wiped out about $140 billion in market value on the S&P 500. The tweet was a fake and the account had been hacked. . . .
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