Most popular multi-platform web properties in the United States in September 2013, based on number of unique visitors (in millions)

  Number of visitors (in millions)
Google Sites 228.2
Yahoo! Sites 222.6
Microsoft Sites 192
Facebook.com 182.1
Amazon Sites 162.6
AOL, Inc. 156.1
Apple Inc. 130.5
CBS Interactive 118
Wikimedia Foundation Sites 116.8
Glam Media 116.1
Turner Digital 109.5
eBay 93.9
Ask Network 90.1
About.com 84.2
Weather.com 83.4
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This statistic shows the most popular web properties in the United States in September 2013, based on their number of unique visitors. During that month, Microsoft sites had 192 million unique multi-platform visitors. Social network Facebook hat 182.1 million unique U.S. visitors from mobile and desktop connections.

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You can find additional information about this statistic on statista.com
http://www.statista.com/statistics/271412/most-visited-us-web-properties-based-on-number-of-visitors/