Search remained the top advertising format by revenue share in 2011, a position it has held since 2006. Search accounted for 46.5% of revenues, up almost 4% from 44.7% in 2010. In dollar terms, search revenues reached $14.8 billion, representing an increase of close to 27% from $11.7 billion the previous year.
Display-related ad revenues was the next-largest category, at 34.8% share, comprised of display banner ad (21.5%), rich media (4.1%), digital video (5.7%), and sponsorship (3.5%). Total display-related revenues were $11.1 billion, marking a 15% rise from $9.6 billion in 2010. While display banner ad and rich media both declined in their share of total revenues, digital video and sponsorship each saw roughly a 1% point increase in share. Read the rest at MarketingCharts.