Worldwide digital ad spending topped $100 billion in 2012,
making up nearly 20% of total advertising investments. Across
the globe, digital ad spending is increasing faster than total
media ad spending, making digital a key driver of total ad
expenditures worldwide. Digital ad spending will continue to
expand its share of total media ad spending through 2016. At
that point, one in four advertising dollars will go towards online
and mobile advertising.