Twitter Promotes Dick Costolo to Chief Executive Job
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Twitter Inc., the social-networking service with more than 165 million users, elevated Chief Operating Officer Dick Costolo to chief executive officer, turning to a manager who is more focused on building revenue.
Evan Williams, the previous CEO, will concentrate on product strategy, according to a blog posting today. Costolo joined San Francisco-based Twitter in September 2009, helping the company introduce advertising services and make licensing deals with Microsoft Corp., Google Inc. and Yahoo! Inc.