According to evening news on April 25 in Beijing Time, Martin Sorrell, CEO of the world's largest advertising company WPP, said Thursday at the Financial Times Digital Media Summit in London that WPP currently invests $7.2 billion annually around the globe for ad space purchases, with 34% going into digital media platforms such as Google and Facebook.Google is currently WPP's second-largest investment platform, with an investment of about $2 billion during the first quarter this year. However, Sorrell indicated that Google will surpass News Corporation to become WPP's largest ad investment platform either this year or next year.In comparison, WPP's investment in AOL was approximately $400 million in the first quarter, about $500 million in Yahoo!, only $270 million in Facebook, and even less in Twitter.Sorrell also stated that current digital media ad investments are not proportional to consumer usage. It's still okay regarding TV and radio, but when it comes to newspapers and magazines, media investment accounts for 20%, while the proportion of time spent by consumers is only 7-9%. As for the Internet and mobile, the proportion of time spent by consumers is 30%, yet the media investment ratio is merely 20%.WPP had previously stated last year that 40% of its business would come from the digital field within the next five years. (Liming)