Yahoo! has just announced an agreement to acquire Right media, Largest Emerging Online Advertising Exchange for approximately $680 million

“The acquisition of Right Media will further Yahoo!’s goal to create the industry’s most open, accessible and vibrant advertising marketplace, which will help democratize the buying and selling of digitally enabled advertising,” said Terry Semel, chairman and CEO of Yahoo!.

The Right Media Exchange is the industry’s largest emerging online advertising exchange, and as publishers increasingly turn to exchanges to monetize their ad inventory, this acquisition will help Yahoo! establish a leading position in this large, attractive and fast growing segment of the online ad market.