Of course, tracking unique visitors does not give the full picture of a Web site's popularity.
According to comScore, a Web tracking firm, the site had 44 million unique visitors in June.
All in, the three sites attract about 180, 000 unique visitors per month, say Breyer and Heber.
With 6 million unique visitors a month, the Khan Academy has proved its utility.
During Hurricane Katrina, on Aug. 29, the site set a record with 7 million unique visitors.
Traffic on Weather.com doubles on hurricane days, spiking to more than 7 million unique visitors.
Sixty content creators attracted 100, 000 unique visitors or more and 114 had 50, 000 readers or more.
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In April Otrib had 25, 000 unique visitors who spent 15 minutes, on average, on the site.
Target and Best Buy were third and fourth, growing their unique visitors 9% and 1% respectively.
Only four retailers got more than four million unique visitors on their website on black Friday.
On Foursquare, in Phoenix, Microsoft had 42 unique visitors, with 55 checkins overall.
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HuffPost had more than 27.6 million unique visitors in January 2011, according to ComScore.
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Ning has more than 100 million registered users and 60 million monthly unique visitors.
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Unique visitors numbers are reached by counting each individual only once in each month.
Online, Forbes.com, ForbesChina.com and ForbesIndia.com reach some 6.8 million monthly unique visitors from Asia.
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Since then, co-founder Dan Gould said the site has attracted more than 500, 000 unique visitors.
One site alone WebMD receives over 100 million unique visitors every month.
And in response to the content, the website recorded just over 3 million unique visitors.
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The traffic goal is based on the number of unique visitors who visit my blog every month.
Kadisha says that the site has grown in stealth mode, organically amassing 80, 000 unique visitors per month.
The site itself drew about 46 million unique visitors on Election Day, according to its internal measurements.
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Barack Obama's campaign website was attracting 8 million unique visitors per month as the 2008 election approached.
The company has 7, 000 publishers using the service and 150 monthly unique visitors and 30 billion image views.
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Rival online audience-measurement firm comScore most frequently uses monthly unique visitors to compile its Web site traffic rankings.
Yahoo Sports reports it had 32 million unique visitors and 254 million page views for the Vancouver Games.
The site averaged 2.9 million unique visitors per month in the 12 months through September, according to comScore.
The company said that monthly unique visitors reached 29.7 million in Q3, up from 295, 000 in Q2 2010.
Zampariolo notes that a small fraction of the site's 34, 000 unique visitors have come from the U.S. military.
This year, canucks.com has averaged nearly a million unique visitors each month, ranking first overall in the League.
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In January 2012, Pinterest attracted over 11 million unique visitors, compared to just 4.9 million in November 2011.
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