The Internet audience viewed 4.6 billion video ads in May, with Hulu generating the highest number of video ad impressions at more than 1.3 billion. Tremor Media Video Network ranked second overall (and highest among video ad networks) with 700.8 million ad views, followed by Adap.tv (642 million) and BrightRoll Video Network (565 million). Time spent watching video ads totaled more than 2.0 billion minutes during the month, with Hulu delivering the highest duration of video ads at 560 million minutes. Video ads reached 45 percent of the total U.S. population an average of 34 times during the month. Hulu also delivered the highest frequency of video ads to its viewers with an average of 48 over the course of the month.