When marketers buy television spots, they can turn on the tube and watch them run. Magazines and newspapers? Marketers can flip to their ads. But when it comes to online inventory, the questions still linger: Are my ads truly running where and when I want them to? Am I wasting impressions and ad dollars serving ads in front of the wrong audience, or are they subject to impression fraud? Are they running next to content that might be offensive to my audience or on the same page as one of my major competitors? Most of us may have chuckled over humorous examples of the wrong ad in the wrong place, but it isn't that funny if it's happened to you.