Internet advertising revenues in the United States totaled $107.5 billion for the full year of 2018, the IAB (Internet Advertising Bureau) announced earlier this month. The fourth quarter of 2018 accounted for approximately $31.4 billion in ad revenue (29.2 percent of the annual total) and the third quarter accounted for approximately $26.6 billion.

Revenues for fiscal year 2018 overall increased 21.8 percent compared with 2017, according to the IAB report, which was prepared by PwC.

“Surpassing $100 billion in annual revenue is a watershed moment for the digital advertising ecosystem—one built on its power to build direct relationships between brands and today’s consumers,” IAB president and chief executive officer Randall Rothenberg said in the IAB report. “Innovative platforms like over-the-top television, podcasts, virtual reality and augmented reality all have the potential to help marketers forge even stronger ties with audiences, as brands navigate the new ‘consumer first’ playing field.”

Advertising growth remained strong throughout the 2018 year, with the fourth quarter showing an 18.1 percent increase in a comparison with the year-ago period.

Advertising revenues delivered on mobile devices totaled $69.9 billion in 2018, a 39.7 percent increase compared with $50.1 billion in the year-ago period, according to IAB. Advertising delivered on a mobile device now makes up 65.1 percent of total internet advertising revenues.

In the digital video category, advertising revenues totaled $16.3 billion in 2018, an increase of 37 percent from the prior year. Revenues from digital video now make up more than 15 percent of total revenues.