At the 4 A's conference in Los Angeles, Sir Martin Sorrell, CEO at WPP, said the ad industry is reaching an inflection point. Google has become a friendly friendamee. It's become a more focused company under Larry Page, he said, but now has five legs, such as search, display, mobile, video, and social. WPP invests about $75 billion in advertising for its clients. Last year WPP invested $1.6 billion in Google, up to $2 billion this year; compared with $200 million and $400 million in Facebook. Last year, WPP invested $6 million in Twitter, but not sure what it will be this year.