Los Angeles-based Rubicon Project, the online advertising optimization technology firm headed by Frank Addante, said that it has been ranked second in terms of unique visitors in online advertising reach, second only to Google. Rubicon said the ranking was released in the comScore Media Metrix monthly ranking of Ad Focus properties for May 2012. Rubicon said it is now reaching 200 million unique visitors in the United States and 650 million global unique visitors. Rubicon Project's online advertising service automates and optimizes digital media advertising for web publishers.