Nov 16, 2010 16:36 GMT  ·  By

The fact that online videos continues to grow shouldn't surprise anyone at this point, but, while YouTube still dominates the market, things are a bit more volatile further down the list. Google video sites, meaning YouTube, got more than 2 billion views in the US alone while Hulu served 1.1 billion video ads in the last month.

"175 million U.S. Internet users watched online video content in October for an average of 15.1 hours per viewer. The total U.S. Internet audience engaged in more than 5.4 billion viewing sessions during the course of the month," comScore reported.

"Google Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property with 146.3 million unique viewers," the analytics company said.

"Yahoo! Sites captured the #2 spot with 53.8 million viewers, followed by Viacom Digital, jumping 4 positions in October with 52.9 million viewers. VEVO secured fourth place with 47.6 million viewers, closely followed by Facebook.com with 47.4 million," it added.

While YouTube managed to hold on to its lead and even see some growth, Facebook lost a couple of spots and was only the fifth video property in the US. This after Yahoo overtook Facebook for the second spot in September. Facebook actually lost 5 million unique viewers in the US in the last month.

Yahoo maintained its number two spot for the second month in a row, but the third spot was grabbed by Viacom. At the same time, Hulu got 1.1 billion video ads, a new high for the site.

Both Hulu's and Viacom's success can be linked to the start of the fall TV season. With new shows hitting the web, people are once again flocking to the places where they can watch them.