Twitter CEO Evan Williams steps down
Twitter founder Evan Williams said Monday he is stepping down from his CEO post to leave it to COO Dick Costolo, a former Google executive.
Read more on The Hollywood Reporter

Twitter Launches Another Scheme to Make Money
As it warned us last week, Twitter launched another scheme today to exploit its 200 million users for advertising purposes. In addition, it took some baby steps toward smoothing relations between itself and third-party developers.
Read more on PC World via Yahoo! News

Twitter Promotes Costolo to CEO, Launches Promoted Accounts
Twitter CEO Evan Williams handed over command of Twitter to COO Dick Costolo, who was largely responsible for getting the startup’s ad initiatives running, including the new Promoted Accounts.
Read more on eWeek