During December 2011, there were 164.3 million unique U.S. video viewers who streamed over 22 billion videos and spent more than 5 hours on average watching online video.

During November 2011, there were 166.9 million unique U.S. video viewers who streamed almost 22 billion videos and spent more than 5 hours on average watching online video.

Nielsen looks at the top online destinations and mobile platforms of 2011

During September 2011, there were 164.4 million unique U.S. video viewers who streamed nearly 18 billion videos and spent almost 5 hours on average watching.

Typical for the summertime when school is out, the TV season has ended and people are vacationing, the number of online video viewers in the U.S. was down slightly in June to 142.6 million unique video viewers.

During May 2011, there were 145 million unique viewers of online video in the U.S. who streamed over 15 billion videos and averaged 4 hours, 20 minutes viewing video content over the course of the month.

Google was the most visited website in the U.S. during April 2011, with 150 million unique visitors from home and work computers. The most visited sites among U.S. web users remained the same as the month before, but Wikipedia leapfrogged Apple to become the 8th most visited site.

In April 2011, there were 141.4 million unique U.S. video viewers who streamed 14.7 billion videos and spent an average of 4 hours, 31 minutes viewing video on PCs/laptops from home and work locations.

Online video usage in the U.S. is up during March, rebounding from the declines typical of the shorter month of February.

The same video brands from last month are still the most popular in February, but with a slight change in ranking as VEVO moved past Facebook to take the #2 spot with 32.3 million unique video viewers.