"Social networking/blogs reached the greatest percentage of mobile users in the U.S. at 21.3 percent, followed by Japan at 17.0 percent and Europe at 14.7 percent."
Source: Japan Mobile Audience “Most Connected” with 3 of 4 Users Accessing Mobile Media in June
Comscore
October 7, 2010
http://www.comscore.com/Press_Events/Press_Releases/2010/10/comScore_Release_First_Comparative_Report_on_Mobile_Usage_in_Japan_United_States_and_Europe
December 15, 2011
Japanese customers rank second in the world for social networking and blogging according to comscore study
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