showing that 183 million Americans watched more than 44 billion online content videos in June, while the number of video ad views surpassed 20 billion.comScore: June 2013 U.S. Online Video Rankings [comscore.com]

Google Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property in June with 158.3 million unique viewers, followed by Facebook with 61.6 million, AOL, Inc. with 51 million, VEVO with 49.3 million and Microsoft Sites with 46.8 million. More than 44 billion video content views occurred during the month, with Google Sites generating the highest number at nearly 15.7 billion, followed by AOL, Inc. with 775 million and Facebook with 730 million. Google Sites had the highest average engagement among the top ten properties.

Other notable findings from June 2013 include:

85.2 percent of the U.S. Internet audience viewed online video.

The duration of the average online content video was 5.3 minutes, while the average online video ad was 0.4 minutes.

Video ads accounted for 31 percent of all videos viewed and 3 percent of all minutes spent viewing video online.