Viewers of online videos prefer short, 5-second preroll ads that are then combined with 10-second, semitransparent banner ads for the same product that appear in the bottom third of the viewing window after the video is over, according to an extensive study by MTV Networks. The study was conducted during the past two years with 50 million video streams on the network Web sites of MTV, Comedy Central, VH1, Nick Jr. and CMT.

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