The WPP Group media agency holding company predicts digital ad spend this year will climb almost as much, to $98.2 billion, or nearly 19% of all measured media spending. North American last year had the highest level of digital ad spending, followed by Asia Pacific and Western Europe. The same pattern is expected to hold this year. Last year, digital advertising in the U.S. increased 12% to $32.2 billion, an amount that represents a 22% share of the overall domestic media market. In 2012, spending is expected to rise 10% to $35.4 billion, a 23% share of media dollars.