Source: Statista

One of the golden rules of advertising is to always follow the eyeballs. And since many of us have our eyes fixed on our smartphones most of the time, it’s no surprise that advertising budgets are shifting to mobile devices as well.

According to Zenith’s latest global advertising forecast, advertisers will spend an additional $75 billion a year on mobile ads in 2018 compared to last year. By then, mobile devices will have overtaken the desktop internet to become the second-largest advertising medium behind television. Zenith expects annual mobile advertising spending to reach $128 billion a year by 2018, well ahead of the $91 billion expected to be spent on desktop internet ads.

This chart shows the estimated change in annual ad spending between 2015 and 2018.

You will find more statistics at Statista