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Dick Costolo

Twitter

#RIPTwitter: 6 Lessons for Every Startup

Just a couple of years ago, everyone though Twitter would be the next Facebook. Then everything went to hell.

What Twitter's Former CEO Is Working On Now

Dick Costolo, who left the social-media company last summer, is helping to build something new.

Twitter: What Went Wrong

Twitter shows that you might have a great product and platform, but you still need to manage it right.

Where Did Twitter's Dick Costolo Go Wrong?

Employees loved him. The board loved him. He charmed the media, and even Wall Street, for a brief honeymoon. Why did investors turn on Twitter's CEO?

Dick Costolo Out as CEO of Twitter

Co-founder Jack Dorsey will temporarily replace him as the company searches for a new chief executive.

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