In a bid to expand its mobile presence, Microsoft just bought the European mobile advertising firm ScreenTonic. As MediaPost reports, ScreenTonic just passed the one billion "page impression" mark on mobile phones.

ScreenTonic works with a variety of clients in the U.K., Belgium, and France, including Coca-Cola, Reebok, Citroën, Jaguar, EMI, Peugeot, BMW and Paramount Pictures.

Microsoft Acquires Mobile Advertising Firm ScreenTonic [MediaPost]