Twitter’s stock spiked in midday trading Tuesday after a fake Bloomberg news report said the company had received an offer to be acquired for $31 billion.

The story appeared convincing, with a Bloomberg Business logo, but Bloomberg quickly tweeted that it was fake. There were some telltale signs it wasn’t authentic: the URL was businessweek.market rather than businessweek.com, and CEO Dick Costolo’s name was misspelled.

That didn’t stop Twitter investors from reacting. The company’s shares on the New York Stock Exchange spiked briefly just before noon Eastern Time, surging about 10 percent from Monday’s close to more than $38 before settling back down as news spread that the report was fake.

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