Facebook Nation: Nearly 3 of 4 online Americans visited social networking site in January

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How popular is Facebook in the U.S.? Here's how popular: Nearly three-quarters of all Americans using the Internet visited the social networking site at least once in January.

(Also see: Google outmaneuvers Apple in content subscription play)

According to Internet research company comScore, Facebook was viewed by 153.0 million unique visitors last month, or 72.2 percent of the overall Internet audience in the U.S.

That performance landed Facebook in the No. 10 slot among comScore's Ad Focus ranking, which lists the top ad-focused sites and networks in order of audience size. As PCWorld pointed out earlier, as recently as last June Facebook was ranked only No. 26, with 141.6 million unique visitors, or 65.9 percent of the U.S. Internet audience.

No. 1 in the Ad Focus listings, not surprisingly, is Google Ad Network, with 197.1 million unique visitors. That's 93.1 percent of all Americans who used the Internet in January.

Here's the full top 10 list:

1. Google Ad Network -- 197.1 million unique visitors (93.1%)
2. Yahoo! Network Plus -- 180.8 million (85.5%)
3. AOL Advertising -- 180.0 million (85.0%)
4. Yahoo! Sites -- 178.9 million (84.5%)
5. Google -- 170.3 million (80.5%)
6. Turn Media Platform -- 168.6 million (79.7%)
7. ValueClick Networks -- 168.5 million (79.6%)
8. 24/7 Real Media -- 165.1 million (78.0%)
9. AdBrite -- 156.1 million (73.7%)
10. Facebook -- 153.0 million (72.3%)

Remember, that listing above is for ad networks. Here are the top 10 Internet properties in January, by unique visitors (in millions).

1. Yahoo! sites -- 178.9
2. Google sites -- 178.5
3. Microsoft sites -- 176.8
4. Facebook -- 153.0
5. AOL -- 111.0
6. Ask Network -- 95.7
7. Turner Digital -- 91.3
8. Viacom Digital -- 89.5
9. Glam Media -- 86.5
10. CBS Interactive -- 85.6

Imagine how frustrating it must be for a Yahoo shareholder to see these traffic numbers on a monthly basis, even as the Internet pioneer remains incapable of increasing overall revenue.

Chris Nerney writes about the business side of technology market strategies and trends, legal issues, leadership changes, mergers, venture capital, IPOs and technology stocks. Follow him on Twitter @ChrisNerney.

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