According to a ZenithOptimedia estimate, global Internet advertising spending will reach US$45 billion this year, and exceed US$60 billion in the year of 2010.

In 2010, North America will still own the lion's share of the overall global online ad spending, which is over one-third of the total. Following are Western Europe and Asia Pacific, according to the estimate.

In terms of online ad share of overall ad spending, North America was taking the lead before 2005, and was surpassed by Western Europe after 2006.

In 2010, Internet ad spending share in Western Europe will be over 15 percent, while those in Asia Pacific and North America account for nearly 12 percent. The online ad share in Central and Eastern Europe and Latin America, however, are still niche – which are less than four percent, according to ZenithOptimedia's data.