Dick Costolo

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Twitter CEO Dick Costolo Stepping Down

Twitter CEO Dick Costolo, who helped turn the messaging startup into a global town square, is stepping down amid criticism over the company’s financial performance.

06/12/2015

(credit: GABRIEL BOUYS/AFP/Getty Images)

Analyst Says Twitter Is Worth $11 Billion

Twitter, the micro-blogging service, may be heading toward an initial public offering, if recent reports are true that the company is valued at $11 billion.

01/03/2013