The Six Companies Fueling an Online Ad Crisis
Posted: 6/11/2013  |  By: Mike Shields | AdWeek
As the controversy swirls over publishers selling advertisers bogus nonhuman traffic, many of the accused have screamed, "It wasn't me! We bought bad traffic from somebody else!"

So, who are these traffic dealers? At Adweek's request, close to a dozen industry experts—representing publishers, ad buyers, DSP and other ad tech execs—have identified six companies that they believe may be selling low-quality, potentially bot-generated traffic—starting at half a penny a click. They are AdOn, Adknowledge, eZanga, Jema Media, MGID and BlueLink Marketing.