2011-03-07 ニールセン調査―米スマートフォン市場でAndroidがiOSとRIMを抜いてトップの座を確保 android http://jp.techcrunch.com/archives/20110303nielsen-android-pulls-ahead-of-rim-and-ios-for-u-s-smartphone-share/ http://blog.nielsen.com/nielsenwire/online_mobile/who-is-winning-the-u-s-smartphone-battle/