Oct 13, 2010 10:34 GMT  ·  By

The online video market is seeing some shifts for the second month in a row with Yahoo taking back the number two spot from Facebook. YouTube, meanwhile, continues to be in a league of its own.

"175 million U.S. Internet users watched online video content in September for an average of 14.4 hours per viewer," comScore reported.

"The total U.S. Internet audience engaged in more than 5.2 billion viewing sessions during the course of the month," it said.

Video proved a bit less popular in September compared to August with 3 million less people viewing a video online in the US. However, the ones that did watch stayed for longer, as the average viewing time grew from 14.3 hours to 14.4 hours.

"Google Sites, driven primarily by video viewing at YouTube.com, ranked as the top online video content property with 144.2 million unique viewers," the analytics company announced.

"Yahoo! Sites captured the #2 spot with 54.4 million viewers, followed by Facebook.com with 52.2 million viewers," it continued.

"Microsoft Sites jumped 3 positions in September, securing fourth place with 45.5 million viewers," comScore added.

YouTube ruled once again not only in terms of viewers but also time viewed. YouTube visitors watched, on average, 260.4 minutes of video. The runner up, Yahoo, got an average of just 30 minutes.

Only Hulu comes close to YouTube in viewing sessions, with an average of 162.6 minutes, but it's only normal thanks to the long-format videos available in the site.

Facebook managed to overtake Yahoo to become the second most visited online property in the US in August. It wasn't to last though, Yahoo is now back in the second spot marginally overtaking Facebook with 54 million visitors versus 52 million.