Twitter exec heading out as company falters

NEW YORK - Twitter's chief operating officer is leaving the company, the latest high-profile departure from the troubled communication service.
    
San Francisco-based Twitter said Wednesday that Adam Bain is stepping down and will be replaced by Chief Financial Officer Anthony Noto. It says it will now look for a new CFO.
    
Bain joined Twitter in 2010 and had been in charge of its business operations and worldwide moneymaking efforts. Hi