"As a CEO you have to balance grit and resiliency with self awareness," he says. "If you just have …

Secondly, Costolo seems to have lost his grip on the Twitter narrative (a point we made back in May…

"Consumers now move fluidly between apps, devices and platforms, and performance advertisers are in…

Aside form Dorsey, other possible candidates for CEO include former Yahoo Inc CEO Ross Levinsohn; M…

Even captains of industry need to unwind from time to time. President Obama plays golf, Arianna Huf…

It's grown to $24 billion, or whatever it is today, 4,000-some people, hundreds of millions of user…

Although Costolo is walking away with nothing in severance, he's already made quite a fortune by ho…

The latest filing shows that Costolo sold his shares over two days, on Jan. 2 and Jan. 5. He also a…

Costolo also said that to grow its user base, Twitter needs to bring media like photos and videos f…

"As a CEO you have to balance grit and resiliency with self-awareness," he said. "If you just have …

Selling stock speaks louder than any words. As the CEO, how do you look the employees in the eye wh…

Investors are betting big that the company will grow into it's equally jaw-dropping valuation: $22.…

Late last year a major Twitter investor called Costolo "an obstacle" and suggested his decision to …

One board member suggested they talk about it more, but Campbell reminded everyone that they were r…

Costolo's fleeting dismissal was the result of a tense board meeting in September 2010. At that tim…

Yes, Costolo's comments were inappropriate and he owes me a formal apology. But I don't for a momen…

We saw an example of that recently when tech academic Vivek Wadhwa criticized Twitter's all-male bo…

Robert Peck, analyst at Sun Trust, was on CNBC today and said, "We think there's a good chance he's…

In 2007, when Twitter was getting off the ground, its co-founder Evan Williams helped round up inve…

Costolo came to Twitter by way of Google. He was the cofounder and CEO of a startup called FeedBurn…