Original Source: Adweek - http://www.adweek.com/news/technology/buyers-bullish-facebook-exchange-143658
News broke in June that Facebook was readying an ad exchange which would enable advertisers to target people of Facebook based on their Web surfing habits on other sites. Facebook had invited a slew of ad tech firms that specialize in real time bidding to run test campaigns via the new exchange, possibly to see which company's technology performs best.