Total revenue of Internet advertising increased by 23.9% to $7.1 bln in Q1 2008 compared to $5.7 bln in Q1 2007, according to IDC. Google continued to extend its leadership position in the U. S. Internet advertising market in Q1 2008: the company’s estimated net advertising market share was 24.8% in Q1 2008, up from 23.1% in Q1 2007.