MySpace, Blogger and YouTube are tops with U.S. audiences, according to the latest Nielsen//NetRatings report, which shows the top U.S. social networking, blogs and video sites in July.

MySpace, with 61 million in unique audiences, has remained the most popular U.S. social networking site, with a 33 percent growth from 46 million in unique audiences in the same period one year ago. Facebook ranked second, with nearly 20 million unique users. However, it showed a dramatic 129 percent growth compared to July 2006. Other sites worth observing are Club Penguin, LinkedIn, and Buzznet.com, all of which grew more than 200 percent each.

The most popular U.S. blog site in July went to Blogger, with 30 million unique audiences in July, much ahead of the second, tmz.com's 10 million.

In addition, YouTube ranked the number one U.S. video site in July this year, with over 55 million unique users, from 31 million in the same period 2006. The second and third went to vids.myspace.com and Google Video, each with less than 18 million unique users.

View the Nielsen//NetRatings report here.