It's no secret that digital advertising has become a key part of most marketing campaigns. Internet advertising spend overtook newspaper ad spending way back in 2013, and eMarketer predicts that it will overtake TV ad spending for the first time by the end of this year. The numbers are huge: an anticipated $72.09 billion spent on digital ads in the United States alone in 2016, a number expected to rise to more than $82 billion next year and more than $113 billion by 2020…
