• by Gavin O'Malley  @mp_gavin, July 17, 2013

Thanks in large part to the increasing mobility of the Web, U.S. consumers viewed a record 20 billion video ads in June.

YouTube parent Google continued to lead the industry with 3.3 billion video ad impressions served during the month, per comScore data. Google sites also ranked as the top online video content property in June with 158.3 million unique viewers, followed by Facebook with 61.6 million, AOL with 51 million, Vevo with 49.3 million, and Microsoft sites with 46.8 million.

LiveRail.com came in second with 2.4 billion ads, followed by BrightRoll with 2.4 billion, Adap.tv with 2.2 billion, and Specific Media with 1.5 billion ad impressions served in June.

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 with 775 million and Facebook with 730 million. Time spent watching video ads totaled 7.5 billion minutes, with BrightRoll delivering the highest duration of video ads at 1.2 billion minutes.

Coast to coast, 183 million Americans watched more than 44 billion online content videos in June, while the number of video ad views surpassed 20 billion. Overall, video ads reached nearly 54% of the total U.S. population an average of 121 times during in June, according to comScore.

Hulu -- which just recently decided to remain an independent venture -- delivered the highest frequency of video ads to its viewers, with an average of 73.

Among YouTube’s top partners, video music channel Vevo maintained the top position in the ranking with 47.5 million viewers. Fullscreen held on to the second position with 34.3 million viewers, followed by Maker Studios Inc. with 28.8 million, Warner Music with 28.4 million and ZEFR (formerly MovieClips) with 26.5 million.

Among the top 10 YouTube partners, Machinima demonstrated the highest engagement (76 minutes per viewer), followed by Maker Studios Inc. (62 minutes per viewer). Vevo streamed the greatest number of videos (534 million), followed by Maker Studios Inc. (477 million).