Microsoft has signed it first U.S. partner for it’s mobile ad network ScreenTonic according to an article by Adweek. The deal with CNBC expands on a deal reached in December to sell as on CNBC.com. ScreenTonic, which Microsoft purchased in May 2007, has so far been focused on the European market. Brian Arbogast, corporate vice president of mobile services at Microsoft, told Adweek that “the company is working to build an extensive mobile network that mirrors its approach online, where the firm has concentrated on sewing up deals with big-name publishers such as CNBC, Facebook and Digg.” The U.S. ad network will show standard banner ads at first, with more advance options including video possible in the future.