Americans are spending 45% more time viewing online video from their PC/Mac/laptops compared to last year, according to recent Nielsen figures. Total video streams have seen considerable year-over-year growth, up 31.5% to 14.5 billion streams and the average streams per viewer has jumped 27.5% to 101.

So which online video outlets are seeing the most action? Among the top-10 US online video brands, YouTube still reigns supreme with 112.8 million monthly unique viewers (January 2011), followed by Facebook with 32.3 million unique viewers. Newcomer VEVO trails behind Facebook with fewer than 100,000 viewers. Also a newcomer to the list, Netlfix takes home ninth place with 7.3 million viewers monthly, a 15.6% increase from December 2010.

Measured by time spent, Netflix was the top destination in January as the average US video viewer spent more than 11 hours watching video on the site from home and work locations.