The money follows eyeballs, this is the way media spend goes in 2013. Advertisers are spending their dollars in the places where you are spending the most of your time. The following chart shows the gap in the market that exists with mobile and the lag in mobile advertising spend. It helps to explain why people are so interested in social applications that dominate the mobile space. In the Us alone their is a $20billion opportunity (VIEW LINK)

James Marlay