Facebook came in as the top social networking site among a custom category of 155 social networking Web sites in September 2009, according to Experian Hiwise. At 58 percent, U.S. visits to Facebook increased 194 percent this year compared with September 2008. MySpace came in as the second-highest market share of U.S. visits for the month, followed by Tagged, with 30 percent and 2.38 percent.
Among the top give visited Web sites, Twitter had the largest percentage gain in market share of visits, increasing 1170 percent compared with September of last year. Overall, U.S. visits to social networking sites increased 62 percent year-over-year among the custom category of 155 of the leading social networking sites.