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The Top 20 Social Networks are shown below for week ending January 30, 2010. Facebook, MySpace, YouTube, Tagged and Twitter take the top 5 spots.

comScore, Inc. , a leader in measuring the digital world, today released September 2009 data from the comScore Video Metrix service, showing that more than 168 million U.S. Internet users watched online video during the month. Online video viewing continued to reach record levels in September with nearly 26 billion videos viewed during [...]

U.S. visits to social networking sites have increased 62 percent year over year;
visits from 55 and older age group have increased 77 percent
Facebook accounted for 58.59 percent of all U.S. visits among a custom category of 155 social networking Web sites in September 2009. The 58 percent was the highest among all social networking [...]

US internet users watched 16.8 billion online videos during April 2009, a 16% increase vs. March, according to monthly data from the comScore Video Metrix service. A significant increase in video viewing at YouTube during April contributed to the month’s sizeable gains.
Total viewing time amounted to 6.4 hours per viewer for the month, [...]

Top Online Web Brands in the United States January 2009