Chart - Suspicious American Ad Traffic By Device

Since the inception of online advertising, there has been fraud. Though the industry has made gains over the years to combat this nonhuman web traffic through the use of ad verification tools and other ad-serving auditors, findings suggest a significant portion of display ad impressions are still fraudulent.

Research by fraud detection company Solve Media found that over six in every 10 impressions served online in the US in Q4 2013 were done so to suspicious, nonhuman agents. This number was up from 44% in Q1 2013—and more than twice as high as mobile-served ads (25%). Read the rest at eMarketer.