I am using WordPress for managing my blog website. I am using an Ad Injection plugin to place my ads where I want in a post. The plugin seems very good, but I saw some ads which were not from ad networks which I was using.
Now I have injected a Google ads leaderboard at some place but I saw advertisement from this advertiser: http://www.adroll.com/about/privacy?utm_source=evidon&utm_medium=AdChoices&utm_campaign=privacy%2Bpolicy
So I want to know whether ad injecting plugin is doing some trick or Google is using ads from other networks too?