Twitter replaced its chief financial officer Tuesday with a former Goldman Sachs banker as the popular one-to-many messaging service reshuffled amid concerns about its ability to grow and prosper. Anthony Noto, 46, will replace Mike Gupta, who will become a senior vice president of strategic investments, according to Twitter. Notos background includes being a managing director of technology, media and telecom investment banking at Goldman Sachs, which led Twitters initial public offering of stock late last year. Twitter made a spectacular Wall Street debut in November, rising from its $26 offering price to more than $70, but has been hurt by concerns about slowing growth and doubts on profitability.