Twitter Keeps Adding Features to Prove It Isn't Completely Dysfunctional

Twitter Chief Executive Officer Dick Costolo has been delivering on his promises in a quest to save his job

Twitter Chief Executive Officer Dick Costolo and his lieutenants stood in front of a roomful of Wall Street analysts in November as they rattled off a list of promises designed to prove they're capable of broadening the site's appeal to nonusers. The crowd that endured the seven-hour presentation had little reason to expect changes soon. Twitter had just switched to its fifth product chief in as many years, and the introduction of new features had stagnated amid the turbulence.

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