Topic - Dick Costolo

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Twitter CEO Dick Costolo speaks during a panel discussion at the International Consumer Electronics Show in Las Vegas on Jan. 8, 2014. (Associated Press) **FILE**

Dick Costolo will step down as Twitter CEO on July 1

Associated Press

This Nov. 4, 2013, file photo shows the sign outside of Twitter headquarters in San Francisco. (AP Photo/Jeff Chiu, File)

Dick Costolo, Twitter CEO: ‘We suck at dealing with abuse and trolls’

By Cheryl K. Chumley - The Washington Times

(Dominic Lipinski/PA Wire via AP Images)

Twitter employees receiving death threats from Islamic State, CEO says

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Twitter unveils self-service advertising system

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Twitter CEO says blocking policy over-distilled

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Twitter simplifies in bid to engage more users

By MICHAEL LIEDTKE - Associated Press

Twitter to show more ads, still biding time on IPO

By MICHAEL LIEDTKE - Associated Press