Twitter appoints Google's Kordestani as exec chairman

(Reuters) - Twitter Inc said it appointed Google executive Omid Kordestani as its executive chairman. Twitter's shares rose 2.4 percent to $29.76 premarket after the company's newly appointed chief executive, Jack Dorsey, tweeted the appointment. Twitter had said it would look elsewhere for a chairman, seeking to allay concerns about co-founder Dorsey's dual role as head of the mobile payments company Square.