Google leads the world in digital and mobile ad revenue

Facebook is a distant No. 2. Advertising is the lifeblood of the internet. Ahead of Google's second-quarter earnings today, here's a look at the state of the company's ad revenue and how it has grown over the years. Google parent company Alphabet makes more money from digital ads than any company on the planet -- it's expected to make $73.8 billion dollars in net digital ad sales in 2017 after subtracting for traffic acquisition costs, according to internet research firm eMarketer. Google repres...