For the most part, online video has been much less ad-heavy than television programming. It is this very fact that has likely been a large part of the medium's popularity. Things may be changing, however. According to Advertising Age, Nielsen is planning on making data available about the viewing of commercials that run in particular shows , whether they are viewed on TV or online. The data would start being available in September, and the publication says it will become the basis for ad negotiations next February.