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Facebook is now the most-visited social network on the mobile web, according to Opera's State of the Mobile Web report. Unique users of Facebook grew more than 600% during 2009, helping the site surpass VKontakte (social network in Russia, Ukraine and Belarus), formerly the most popular social network among Opera Mini users.

Twitter saw its usage increase more than any other social network, surging more than 2800% in just one year.

Facebook is the top social-networking site, worldwide. Given the popularity of Opera in Russian-speaking countries, VKontakte used to be in the top position (based on unique users), but it was overtaken by Facebook in 2009.

All of the listed social-networking sites, except for Friendster, showed significant user growth (via Opera Mini) in 2009.

"Four years ago this month we released Opera Mini to the world," said Jon von Tetzchner, Co-founder, Opera Software. "Fortunately the divide between the mobile Web and the Web accessed on PCs is now disappearing. People want to use the same sites, regardless of whether they use a phone or PC to access those sites. The success of Facebook and Twitter among Opera Mini users shows that consumer habits do not change even though their devices do."

Some other stats:

In December 2009, more than 46.3 million people used Opera Mini, an 11% increase from November 2009 and more than 159% compared to December 2008.

Those 46.3 million people viewed more than 20.7 billion pages in December 2009. Since November, page views have gone up 10.1%. Since December 2008, page views have increased 223%.

Opera Mini users generated over 315 million megabytes (MB) of data for operators worldwide in December 2009. Since November, the data consumed went up by 10.5%. Data in Opera Mini is compressed up to 90%. If this data were uncompressed, Opera Mini users would have viewed over 2.9 petabytes (PB) of data in December. Since December 2008, data traffic is up 206%.

The top 10 countries ranked by number of Opera Mini users are (in order): Russia, Indonesia, India, Ukraine, China, South Africa, United States, Vietnam, Nigeria, and United Kingdom. This month Ukraine overtook China, Vietnam continues its ascent (at the expense of the United Kingdom) and Nigeria is back on the list after a 3-month absence, pushing Poland out of the top 10 for the first time.

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