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Facebook may be growing in popularity, but Google is still the web brand to beat.

In 2011, an average 153.4 million people in the U.S. visited Google sites each month, making the search giant the most-visited U.S. web brand of the year, according to Nielsen.

Facebook was the second most-visited U.S. web brand and the top social network, averaging 137.6 million visitors per month, Nielsen found. In the social networking and blogs category, Facebook beat out Blogger, Twitter (and of course Google+) by massive margins.

Nielsen looked at web traffic from home and work computers from January through October 2011 to determine the top web brands of year. The company’s data is limited to the desktop and does not include mobile visits, a category of growing importance as consumer browsing and social media behaviors switch over to mobile devices.

For comparison, Experian Hitwise published its list of most-visited sites and most-searched terms of the year, and gave Facebook the grand prize in both categories. Why the discrepancy? Facebook had more U.S. visits than, but if you combine visits to all Google properties — not just — Google actually had the edge over Facebook in 2011, according to Experian Hitwise. The companies are also measuring different things; Nielsen focused on individual visitors per month while Experian Hitwise looked at total visits for the year.

Nielsen’s numbers meanwhile paint a fairly consistent story. Even as far back as December 2009, Google ruled Nielsen’s U.S. web brand chart with 146.7 million unique visitors, and Yahoo ranked second with 129 million uniques. Somewhat surprisingly considering all its turmoil, Yahoo still maintains the third position as a top web brand and averages 130 million visitors per month.

The only real dramatic change to the list over the past two years is the ascendance of Facebook, which saw nearly 110 million unique visitors in December 2009 but now sees 137.6 million folks visit its website, on average, each month. Facebook, however, blows away the competition in terms of time on site. In September, Nielsen found that the average Facebooker spent 7 hours, 24 minutes on the site, while the average Googler clocked in at just one hour, 43 minutes for the month.

So while Google wins the web today, the numbers point to a looming regime change.

[Image via maistora/Flickr]

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