Comscore media metrix has released its top 50 web properties of US in the month of september. According to them financial markets and the presidential elections were the major source of traffic on the internet in US.
Google tops the list with more than 144 million unique visitors followed by Yahoo with 141 million and then Microsoft with 121 million. Among the major ones, following is the list -
Rank Website
1. Google
2. Yahoo
3. Microsoft
6. Ebay
9. Amazon
12. Apple
16. Facebook
19. Adobe
22. Wal-mart
33. WordPress
19. Adobe
50. Firefox
For complete list check this.

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