Google display advert revenue this year (aka YouTube, Doubleclick, etc.) will hit around $2.75 billion while Facebook will likely hit $3.5 billion. Google's se

Google display advert revenue this year (aka YouTube, Doubleclick, etc.) will hit around $2.75 billion while Facebook will likely hit $3.5 billion. Google's search ad business is safe, but Google's content network could face a major challenge if Facebook launches a competitor. As most people leave Facebook logged in, Facebook could do much more accurate ad targeting as well as avoiding the huge fraud problems that Google faces.