Rapid growth in social media and online video advertising is driving increases in the global display advertising market, which is forecast to rise by 20% annually from 2011 through 2014, according to a June 2012 forecast from ZenithOptimedia. The forecast calls for display advertising to account for 40% of global internet advertising in 2014 (or US $47.75 billion), up from 36% in 2011. And while paid search will still account for the largest proportion of online ad spending in 2014, at roughly 48.2%, that will be a small drop from 49.7% in 2011, due to slightly more muted annual growth of 15%. Overall, online advertising is expected to grow on average by 16% a year between 2011 and 2014, with classifieds posting the slowest annual growth of the major sub-categories, of 8%. Read the rest at MarketingCharts.