Twitter Shares Soar to Record on Optimism for Mobile-Ad Growth

Twitter Inc., the microblogging service that held its initial public offering last month, rose to a record for a third trading day amid optimism that the company has room to expand sales in digital advertising. Twitter jumped 8.4% to $69.96 at the close in New York after rising 7.5% yesterday. The stock has surged 169% since going public at $26 on Nov. 6, giving Twitter a market value of almost $40 billion — larger than Time Warner Cable Inc., media company Viacom Inc. and retailer Target Corp...