Online advertising firms will waste $9.5 billion this year advertising to bots guaranteed to buy nothing, according to numbers from Solve Media. China, Venezuala, and Ukraine generated the highest levels of suspicious traffic for Web ads, while Singapore, Macau, and Qatar were responsible for the largest amount of suspicious mobile-ad traffic. The company estimates that in the United States, Web-based ad traffic was 44 percent suspicious and mobile traffic was 22 percent suspicious in the second quarter.
Source: https://threatpost.com/report-online-ads-waste-9-5b-in-2013/102226/